In lieu of, or in addition to, the procedures in this subpart, the required minimum capital ratios for a national bank or Federal savings association may be established or revised through a written agreement or cease and desist proceedings under 12 U.S.C. 1818 (b) or (c) (12 CFR 19.0 through 19.21 for national banks and 12 CFR part 109 for Federal savings associations) or as a condition for approval of an application.