This excerpt taken from the PNC 10-K filed Feb 29, 2008.
LOANS AND LEASES
Except as described below, loans held for investment are stated at the principal amounts outstanding, net of unearned income, unamortized deferred fees and costs on originated loans, and premiums or discounts on loans purchased. Interest on performing loans is accrued based on the principal amount outstanding and recorded in interest income as earned using the interest method. Loan origination fees, direct loan origination costs, and loan premiums and discounts are deferred and amortized to net interest income, over periods not exceeding the contractual life of the loan.