We hypothesize that bank regulatory and supervisory activities substitute for bank auditing activities, providing auditors with incentives to expend less effort on audits of banks than on audits of similar firms not subject to regulation and supervision. We show that banks exhibit fewer internal control and accounting problems, as measured by the frequencies of disclosed material internal control weaknesses and financial statement restatements, than do similar firms. We show that auditors expend less effort, as indicated by lower audit fees and shorter audit report lags, in audits of banks than in audits of similar firms, more so when bank regulation and supervision are more intense. Lastly, we show that banks are more likely than similar firms to exhibit two types of earnings management that are of minor concern to bank regulators and supervisors but have capital market consequences and so should concern auditors: more frequent small positive earnings changes and longer strings of earnings increases. Prior research shows that these types of earnings management have capital market consequences, which suggests they may lead to reduced market discipline over banks. We expect these results to be of interest to bank and auditing policymakers.