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Atlanta Fed Working Papers


The Effect of the Common Bond and Membership Expansion on Credit Union Risk

W. Scott Frame, Gordon V. Karels, and Christine McClatchey
Working Paper 2001-10
April 2001

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This paper examines differences in institutional risk profiles based on credit union membership type and membership expansion via “select employee groups,” or SEGs, which are now expressly allowed by the Credit Union Membership Access Act of 1998. A cross-sectional statistical model is specified that examines risk variation relative to the type of common bond and the breadth of the credit union’s membership. In findings that are consistent with earlier research, the authors document that occupationally based credit unions have a unique risk profile relative to other common bonds. This profile includes a greater exposure to concentration risk, which is hedged by holding greater proportions of capital.

The authors also examine the subsample of Single-Bond occupational credit unions and those Multi-Bond credit unions with primarily occupational group members. They find that the presence of SEGs is negatively related to capital ratios and positively related to loan-to-share ratios relative to the Single-Bond occupational credit unions. The use of survey data documenting the number of SEGs confirms that, as more SEGs are added, credit unions tend to increase their loan-to-share ratios and decrease their capital ratios. However, the number of SEGs and the proportion of loan delinquencies are found to be positively related, suggesting that the informational advantages associated with the common bond become diluted as new groups are added. Overall, the authors conclude that there are material benefits of credit union membership diversification and that these benefits derive from expanded investment opportunities and reduced concentration risk.

JEL classification: G21, G28

Key words: credit unions, common bond, concentration risk


The authors are indebted to the Credit Union National Association for sharing their survey data on the number of select employee groups at individual credit unions. They also thank Sam Allgood, Brian Tishuk, seminar participants at the 1999 Financial Management Association meetings, and two anonymous referees for helpful comments. The views expressed here are the authors’ and not necessarily those of the Federal Reserve Bank of Atlanta or the Federal Reserve System. Any remaining errors are the authors’ responsibility.

Please address questions regarding content to W. Scott Frame, Senior Economist, Research Department, Federal Reserve Bank of Atlanta, 104 Marietta Street, N.W., Atlanta, Georgia 30303-2713, 404-498-8783, scott.frame@atl.frb.org; Gordon V. Karels, Nebraska Bankers Association College Professor of Banking, Finance Department, University of Nebraska, Lincoln, Nebraska 68599-0405, 402-472-3860, gkarels1@unl.edu; or Christine McClatchey, Finance Department, Monfort College of Business, University of Northern Colorado, Greeley, Colorado, 80639, 970-351-1248, christine.mcclatchey@unco.edu.

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