Excessive exposure (large loans to an individual borrower and in aggregate) by a credit union can create a concentration of risk on the balance sheet and increase a credit union's vulnerability to bad debt. This can lead to a strain on capital and solvency. While this risk cannot be eliminated, it can be contained by limits and controlling the extent to which credit unions commit themselves to large exposures. Therefore the large exposure limits set the maximum sum that may be loaned to any one member as a percentage of reserves to prevent concentration. All credit unions should set and document their own large exposure policy limits to avoid concentration of risk.