(a) The commissioner, after a determination of value in accordance with generally accepted accounting principles, may order that assets in the aggregate, to the extent that such assets have depreciated in value, or to the extent the value of such assets, including loans, are overstated in value for any reason, be charged off, or that a special reserve or reserves equal to such depreciation or overstated value be established.(b) A credit union's financial statements shall provide for full and fair disclosure of all assets, liabilities, and members' equity, including such valuation allowance accounts as may be necessary to present fairly the financial position; and all income and expenses necessary to present fairly the results of operations for the period concerned.(c) The Board of directors is responsible for ensuring that the credit union has controls in place to consistently determine the allowance for loan and lease losses (ALLL) in accordance with its written polices, generally accepted accounting principles, and relevant supervisory guidance. Policies shall be appropriately tailored to the size and complexity of the credit union and its loan and lease portfolio. As a minimum, a credit union shall develop, maintain, and document the methodology used to determine the amounts of an appropriate ALLL and provisions for loan and lease losses. Adjustments to the ALLL shall be made prior to the end of each calendar quarter in order to accurately reflect the loss exposure on the quarterly call reports.