Loans and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2024 USD ($) Loan	Mar. 31, 2023 USD ($) Loan	Dec. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan portfolio purchases included in credit card receivables	$ 109,400,000
Proceeds from sales of loans held for sale	18,399,000	$ 13,692,000
Nonaccrual Loans	17,756,000		$ 13,212,000
Restructured loans	517,000		548,000
Total Past Due	23,637,649,000		23,172,484,000
Non accrual loans with no related allowance for credit losses	17,756,000		13,212,000
Accrued interest on loans	$ 123,100,000		119,600,000
Number of reasonable and supportable forecast period	1 year
Modifications made to borrowers experiencing financial difficulty commitment to lend	$ 0	$ 0
Loan modifications made to borrowers experiencing financial difficulty | Loan	0	0
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of reasonable and supportable forecast period	1 year
Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of reasonable and supportable forecast period	3 years
Greater than 90 days Past Due and Accruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Past Due	$ 3,076,000		$ 3,111,000
Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Proceeds from sales of loans held for sale	$ 18,400,000	$ 13,700,000