Loans and Allowance for Credit Losses - Effects of Loan Modifications Made During the Period (Detail)	3 Months Ended
	Mar. 31, 2023
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	2.40%
Weighted-Average Months of Term Extension	5 months
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	5.00%
Weighted-Average Months of Term Extension	6 months
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	1.20%
Weighted-Average Months of Term Extension	120 months
Credit Card Receivable [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	16.00%
Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	6.60%
Weighted-Average Months of Term Extension	151 months
Loans Purchased From Government National Mortgage Association Mortgage Pools [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	0.70%
Weighted-Average Months of Term Extension	66 months