This excerpt taken from the PNC 10-K filed Feb 29, 2008.
LOANS AND COMMITMENTS HELD FOR SALE
We designate loans and related loan commitments as held for sale when we have a positive intent to sell them. We transfer loans and commitments to the loans held for sale category at the lower of cost or fair market value. At the time of transfer, related write-downs on the loans and commitments are recorded as charge-offs or as a reduction in the liability for unfunded commitments. We establish a new cost basis upon transfer and recognize any subsequent lower of cost or market adjustment as a valuation allowance with charges included in noninterest income. Gains or losses on the actual sale of these loans and commitments are included in noninterest income when realized.
We apply the lower of cost or fair market value analysis on pools of commercial mortgage loans and commitments on a net aggregate basis. For other loans held for sale and commitments, we do this analysis on an individual loan and commitment basis.
Interest income with respect to loans held for sale classified as performing is accrued based on the principal amount outstanding.
In certain circumstances, loans and commitments designated as held for sale may be later transferred back to the loan portfolio based on a change in strategy to retain the credit relationship with those customers. We transfer these loans and commitments to the portfolio at the lower of cost or fair market value.