Banks take inevitably a lot of illiquid assets in their balance sheet. Therefore, they cannot easily manage or hedge their loan portfolios and have to hold most of the assets to maturity. The consequence is that banks expect and anticipate some losses. The survival of the bank is contingent to having losses lower than the revenues and the provisions. However, in the unfavorable cases, the portfolio will suffer larger losses than expected, and the risk of loss on the risky assets of the portfolio is used to measure the bank’s cost of doing its business.