12 C.F.R. § 3.31
(a) General risk-weighting requirements. A national bank or Federal savings association must apply risk weights to its exposures as follows:
(1) A national bank or Federal savings association must determine the exposure amount of each on-balance sheet exposure, each OTC derivative contract, and each off-balance sheet commitment, trade and transaction-related contingency, guarantee, repo-style transaction, financial standby letter of credit, forward agreement, or other similar transaction that is not: