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This study strives to examine the relationship between bank capital and bank liquidity level considering the joint determination of both variables pointed out in the related literature. The evidence is from the Gulf Cooperation Council (GCC) countries: Saudi Arabia, Kuwait, the United Arab Emirates, Qatar, Bahrain and Oman. The theory of banking postulates that bank capital and bank liquidity are interrelated through various links. The study conjectures that large GCC banks do not have a concern with respect to liquidity due to the implicit guarantee of GCC wealthy governments to bank deposits.

The study sample is comprised of all chartered GCC conventional and Islamic banks. The study employs several on-balance sheet ratios to proxy for bank capital and liquidity as defined in the banking literature. It also employs a related econometric model that considers the simultaneity issue pointed out in the related literature.

The results of the study reveal that GCC banks react positively when facing illiquidity by strengthening their capital ratio. Further analysis reveals that only small GCC banks (conventional and Islamic) tend to increase their capital levels when facing a liquidity shortage, which confirms the study conjecture that larger GCC banks have no credible concern about their liquidity position. Employing an alternative measure of liquidity does not change the results. This finding supports the financial fragility structure and the crowding out of deposits hypotheses.

The study contributes to the literature by employing a novel estimation approach to explore the difference in results as the sample banks represent two banking regimes, the conventional banks as well as the Islamic banks. Also, the study implicitly suggests that further research in this area could support the need to impose minimum and globally uninformed liquidity standards on banks.

This study investigates the determinants of net interest margin (NIM) and tests the decoupling hypothesis in Turkey's Islamic and conventional banks.

This study has employed a panel quantile model (PQM) to assess the net interest margin (NIM) and test the decoupling hypothesis in the dual banking system of Turkey.

The empirical results show that the impact of equity is positive for both Islamic and conventional banks but relatively more robust for Islamic banks. Moreover, it is observed that return on assets has a positive association with NIM in both types of banking systems. Interestingly, the impact increases from lower to higher quantiles, but a higher acceleration rate is observed for Islamic banks. The study also finds that, as bank stability increases, NIM decreases for both groups of banks but more stably for Islamic banks, resulting in lower margins than conventional banks. Thus, the paper confirms the decoupling hypothesis and suggests that, to increase profit margins, Islamic banks need to increase assets and equity.

The paper confirms the decoupling hypothesis and suggests that to increase profit margin, Islamic banks need to increase assets and equity.

Since both equity and assets contribute positively to interest margins, policymakers in the industry need to increase the size of equity and assets to get maximum returns.

This is one of the first studies to investigate NIM's determinants and test the decoupling hypothesis in the Turkish dual banking system using a non-parametric MCMC panel quantile regression (QRM) model.

The aim of this study is to conduct a comparative analysis between Islamic and conventional banks in terms of whether Islamic banks was more or less resilient/risky than conventional counterparts to the pandemic shock. It also examines the role of capital in improving the performance and stability within the two banking systems.

This study uses 82 banks from MENA (Middle East and North Africa) region for periods across 2011–2020, and employs a dynamic panel data approach to examine the resilience within both banking systems during the Covid-19 pandemic.

The results show that the Covid-19 pandemic has a negative impact on conventional banks' stability. However, Islamic banks performed better and were less risky than conventional ones. Banks with high-quality capital are more effective at controlling their risks and improving their performance during the pandemic.

The results offer important financial observations and policy implications to many stakeholders engaging with banks. Actually, the findings of this study facilitate to the stakeholders and bankers to have an alluded picture about determinants of risk and performance. The results can be used by bankers’ policy decision-makers to improve and enhance their consideration for risk management, taking into consideration the type of banking systems.

Compared to the various studies on the stability of Islamic and conventional banks, researchers have not sufficiently addressed the effect of the Covid-19 pandemic on risk and performance. Moreover, none of these studies has examined if Islamic banks was more or less resilient/risky than conventional counterparts to the pandemic shock. This leads the authors to identify the similarities and differences between two types of banks in the MENA region in a pandemic shock context.

This study aims to investigate differences between Islamic and conventional banks in Pakistan with respect to their operational efficiency, liquidity risk and asset quality. Importantly, in addition to full-fledged Islamic and conventional banks, this study also investigates a more recently emerged breed of hybrid banks, i.e. Islamic divisions of conventional banks.

Data for the period 2011–2020 was collected from financial reports of all full-fledged Islamic banks (5), Islamic banking divisions of conventional banks (8) and conventional banks (20) in Pakistan. Logistic regressions were designed to test the proposed hypotheses.

The findings suggest that full-fledged Islamic banks are operationally less efficient and experience higher liquidity risk than conventional banks. However, the asset quality of Islamic banks is better than that of conventional banks. Next, in the robustness analysis, the authors extended the sample size by adding the Islamic divisions (window) of the conventional banks; they found almost the same result except for efficiency which turned out to be non-significantly related to bank type.

The findings are beneficial for investors, depositors, consumers and bank management in understanding the financial features of such as efficiency, liquidity and liquidity risk that separate Islamic banks from conventional banks.

The findings of this study present a clear picture to bankers and practitioners about some financial features of banking systems and depict that Islamic banks are in need to improve their liquidity risk management practices to compete with conventional banks.

While the Noble Quran dictates the prohibition of interest, conventional banks promote Islamic banking by opening Islamic banking windows. Against this backdrop, this study aims to investigate the perceived gaps between managers and clients in Islamic marketing and banking, focusing on conventional banks’ Islamic banking windows.

Guided by a qualitative approach, semi-structured personal interviews and observations served as the data collection methods, involving 25 banks and 50 respondents in 3 different districts, namely, Shirajganj, Rajshahi and Chapainawabganj of Bangladesh from January to October 2023. The data were analysed using ATLAS.ti 2023 to explore codes and quotations derived from 14 interview questions. Further, ATLAS.ti 2023 facilitated synthesizing content, concepts, code occurrence, network analysis and thematic analysis.

Islamic and non-Islamic banks use Quranic verses, hadiths (prophetic traditions), images of mosques, the Kaaba and Arabic texts as Islamic marketing tools. These spiritual, divine and prescriptive tools are associated with Islamic banking. However, conventional banks receive criticism for having separate Islamic banking windows to serve religiously conscious clients, which generates tension among clients and bank managers.

The findings can theoretically assist academics in examining conventional banks’ Islamic marketing and banking practices, opening Islamic banking windows. Importantly, Shariah boards can play policy roles in safeguarding the function of Islamic marketing and banking. Managers can use the findings to anticipate client perceptions and enhance Islamic marketing and banking strategies. Likewise, the social implications include the explicit stance of Shariah to mitigate the mixture of halal and haram banking.

This pioneering study explores the perspectives of Islamic banking windows by non-Islamic banks. The combination of Islamic marketing and banking is a noteworthy novelty in this study and deserves recognition for its unique contribution to halal marketing and finance.

The aim of this paper has twofold: (1) to explain and compare the financial evolution of Islamic and conventional banking sector in the Gulf Cooperative Council (GCC) countries before and during the COVID-19 pandemic and (2) to explore the key success factors that might affect Islamic and conventional banks performance before and mainly during COVID-19 pandemic period.

Orbis Bank Focus database and annual financial reports are used to collect financial information of Islamic and conventional banks in GCC countries over four years: 2017, 2018, 2019 and 2020. Descriptive statistics, T-test, multiple regression, and 2SLS and GMM models are employed to analyze the financial structure and performance of Islamic and conventional banks before and during the COVID-19 pandemic period.

Results of this study reveal that (1) there is a significant difference between Islamic banks and conventional banks during the crisis of COVID-19, where the conventional banks have presented a higher level of financial performance and financial liquidity than their Islamic counterparts, (2) conventional banks have revealed higher capacity to manage their financial risk during the crisis period, and (3) a high level of non-performing loan, high inflation rate and high percentage of non-important cost have a negative impact on the financial performance of Islamic banks mainly during the pandemic period of COVID-19. However, the result indicates that a high level of liquidity risk increased the performance of Islamic banks but this impact falls sharply during the pandemic period.

This study provides information that supports investors, regulators and executive managers in GCC countries. A well-structured balance sheet would improve the financial performance and risk management of the banking sector in GCC countries, especially in times of crisis and pandemics.

This paper aims to examine the relationship between gender diversity and the risk profile of 141 listed banks from 14 emerging countries over the period of 2012–2020. Specifically, this study investigates whether the relationship between gender diversity and banking risk varies between Islamic banks and conventional banks, both before and during the COVID-19 pandemic. The second aim is to investigate whether COVID-19 health crisis moderates the effect of gender diversity on banks’ risk-taking behavior within a dual banking system.

This study derives its theoretical foundation from both the token theory and the critical mass theory. Both fixed and random effects are combined to examine the relationship between gender diversity and bank risk-taking in emerging countries.

The results show that female presence on the board of directors reduces banks' financial risk. However, the presence of women continues to positively affect the capital adequacy ratio of large banks. The results also show that the presence of at least two female directors significantly reduces banking risk. The findings support the expectations of the token and critical mass theories. In addition, the presence of female board members, per se, does not influence the risk-taking behavior of Islamic banks. Finally, this study demonstrates that the moderating role of the COVID-19 health crisis is only more effective for large banks than for small ones. The analyses demonstrate good reliability and robustness of the findings of this study.

The study provides novel insights for policymakers and practitioners on how female directors impact banks’ risk-taking behavior in dual-banking countries. It also contributes to the debate on gender diversity and corporate governance literature, which can help in monitoring bank risk-taking and improving financial stability.

This study presents new evidence about the importance of board gender diversity for bank risk-taking in a dual banking system by considering the moderating influence of the COVID-19 pandemic. This study also contributes to the literature on bank risk-taking by applying two measures of gender diversity and a critical mass of women on boards.

This study aims to examine the triple relationship between capital regulation, banking lending and economic growth in a dual markets. Specifically, the author seeks to explore how changes in capital regulation can impact banking lending practices and subsequently influence economic growth, while also investigating the reciprocal effects of banking lending on economic growth.

The author follows several previous studies such as Shrieves and Dahl (1992), Beck and Levine (2002), Altunbas et al. (2007), Saeed et al. (2020) and Stewart et al. (2021) to identify a system of three equations, regarding economic growth, capital and banking financing growth, respectively. The author estimates the parameters of all equations simultaneously using the seemingly unrelated regression method (Zellner, 1962) for a sample of 46 Islamic banks and 113 conventional banks during 2002–2022. These banks operate in 13 Muslim countries from Middle East and North Africa and Southeast Asia.

The author’s findings demonstrate that in the case of Islamic banking, an increase in loan growth stimulates economic growth, while an increasing capital ratio positively influences economic growth but is accompanied by a reduction in loan growth. This result corroborates the findings of Stewart et al. (2021), which indicate that regulatory capital reduces unstable credit while improving gross domestic product growth. However, in the case of conventional banks, the response to an increase in loan growth on Gross Domestic Product Per Capita Growth (GDPCG) is ambiguous, while the capital ratio improves GDPCG and promotes LOANG, which, in turn, increases risk.

The Islamic banks can continue to significantly contribute to economic growth by effectively directing their available capital toward viable investment opportunities and supporting sustainable financial practices, even in the presence of potential constraints on loan growth. As for conventional banks, they are invited to increase their capital levels to ensure a strong and resilient financial system that can support lending and facilitate economic growth.

To the best of the author’s knowledge, this paper is the first to explore the triple relationship between capital requirements, Islamic bank lending and economic growth.

This study aims to evaluate the interaction between bank capital and explicit deposit insurance scheme (DIS) on the financial stability of Islamic and conventional banks.

The author's sample covers 52 Islamic and 108 conventional banks operating in 12 countries over the period 2000–2021 using the random-effects generalized least squares (RE-GLS) regression technique.

The author's results reveal that bank capital negatively mediates the relationship between explicit DIS and the financial stability of both Islamic and conventional banks. Additionally, explicit DIS has a positive impact on the financial stability of conventional banks. However, the results are mixed for Islamic banks, as the effect of explicit DIS is positive for the Middle East and North Africa (MENA) region but negative for the South and Southeast Asia (SSA) region. Finally, the interaction between explicit DIS and the COVID-19 pandemic has a negative effect on conventional banks operating in the MENA region, while it has a positive effect on Islamic banks operating in the SSA region.

The findings of this paper have important implications for regulators in evaluating DIS policies and in anticipating any potential adverse consequences that might arise for both Islamic and conventional banks in normal and crisis times. Policymakers should strive to preserve the benefits of DIS while mitigating the destabilizing effects of its interaction with capital ratios.

This study introduces a novel aspect by examining the mediating role of capital in the relationship between explicit DIS and the financial stability of Islamic and conventional banks.

This paper provides a comprehensive review of the influential and intellectual aspects of the literature on the Gulf Cooperation Council (GCC) region's banking activities.

This study undertakes a bibliometric meta-analysis review of the GCC region banking literature, covering 199 articles published between 2004 and 2022, extracted from the Web of Science (WoS) database, followed by a content analysis of highly cited papers.

This paper identifies the influential aspects of the GCC region banking literature in terms of journals, articles, authors, universities and countries. The paper also identifies and discusses five major research clusters: (1) bank efficiency; (2) corporate governance (CG) and disclosure; (3) performance and risk-taking; (4) systemic risk, bank stability and risk spillovers and (5) intellectual capital (IC). Finally, it identifies gaps in the literature and highlights some important research issues that provide directions for future research.

This paper is limited to the articles indexed in the WoS database and written in English. Though the WoS database encompasses a wide range of multidisciplinary journals, there is a chance that some relevant articles are not included in the WoS database or written in another language.

This study provides regulators, practitioners and academics with valuable insight and an in-depth understanding of the banking system of the GCC region.

To the best of the authors' knowledge, this is the first review paper on GCC region banking literature. This study provides regulators, practitioners and academics with valuable insight and an in-depth understanding of the banking system of the GCC region.