Loans and Allowance for Credit Losses - Effects of Loan Modifications Made During the Period (Detail)	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2023
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	21.50%	21.00%
Weighted-Average Months of Term Extension	13 months	10 months
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Months of Term Extension	11 months	10 months
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	0.90%	1.30%
Weighted-Average Months of Term Extension	99 months	109 months
Credit Card Receivable [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	15.40%	15.10%
Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	9.10%	7.80%
Weighted-Average Months of Term Extension	2 months	4 months
Loans Purchased From Government National Mortgage Association Mortgage Pools [Member]
Financing Receivable, Modifications [Line Items]
Weighted-Average Interest Rate Reduction	0.50%	0.60%
Weighted-Average Months of Term Extension	121 months	98 months

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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