Loans and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended			6 Months Ended
	Jun. 30, 2024 USD ($) Loan	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($) Loan	Jun. 30, 2024 USD ($) Loan	Jun. 30, 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				$ 38,013,000	$ 30,629,000
Nonaccrual Loans	$ 13,743,000			13,743,000		$ 13,212,000
Restructured loans	315,000			315,000		548,000
Total Past Due	24,197,462,000			24,197,462,000		23,172,484,000
Non accrual loans with no related allowance for credit losses	13,743,000			13,743,000		13,212,000
Accrued interest on loans	130,800,000			$ 130,800,000		119,600,000
Number of reasonable and supportable forecast period				1 year
Modifications made to borrowers experiencing financial difficulty commitment to lend	$ 0		$ 0	$ 0	$ 0
Loan modifications made to borrowers experiencing financial difficulty | Loan	0		0	0	0
Consumer Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Proceeds from sales of loans held for sale				$ 38,000,000.0	$ 30,600,000
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Number of Contracts | Loan	2		0	2	0
Pre-modification loan balance	$ 291,000			$ 291,000
Post-modification loan balance	293,000			$ 293,000
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	$ 5,644,000			$ 5,644,000		$ 3,111,000