Upon written request from the public, the bank shall make available the names of its executive officers and principal shareholders to whom, or to whose related interests, the bank has outstanding as of the last quarter-end an extension of credit that, when aggregated with all other extensions of credit to that person and the related interests of that person, equals or exceeds 5 percent of unimpaired capital and unimpaired surplus, or $500,000, whichever is less. Records of such requests must be maintained for two years.