Commercial banks are distinguished from other financial institutions by their accepting deposits and provision of loans. The Federal Reserve classifies bank loans into several categories: real estate loan, agricultural loan, commercial and industrial loan (C&I), loan to depository institutions, consumer loan, obligations to state and political subdivision, and foreign loan (Saunders, 2008). Loans are the basic source of revenue and a major part of asset for banks. Loan portfolio problems have historically been a major cause of bank failure (Comptroller’s Handbook, 1998). Loans are associated with default risk in addition to the inherent risk of individual loans. Thus, according to the Modern Portfolio Theory the objective of the bank manager is to choose a loan portfolio that minimizes risk given the expected return of the portfolio.
The recent financial crisis of 2008 had severe consequences for commercial banks. According to the Federal Deposit Insurance Corporation (FDIC) 25 commercial banks failed and several others declared bankruptcy during 2008. These failures are likely to cause a decline in confidence that would make commercial banks reluctant to lend money amongst themselves or to others.