Loans and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($) Tdr	Jun. 30, 2023 USD ($) Loan	Jun. 30, 2022 USD ($) Tdr	Dec. 31, 2022 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Proceeds from sales of loans held for sale		$ 30,629,000	$ 22,267,000
Nonaccrual Loans		19,347,000		$ 19,269,000
Restructured loans		3,200,000		5,200,000
Total Past Due		22,483,542,000		21,031,189,000
Non accrual loans with no related allowance for credit losses		16,858,000		16,704,000
Accrued interest on loans		$ 91,600,000		90,600,000
Number of reasonable and supportable forecast period		1 year
Commitments to lend to borrowers with loan modifications classified as TDR's	$ 0		0
Modifications made to borrowers experiencing financial difficulty commitment to lend		$ 0
Loan modifications made to borrowers experiencing financial difficulty | Loan		0
Default payment of troubled restructuring	$ 0		0
Consumer Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Proceeds from sales of loans held for sale		$ 30,600,000	$ 22,300,000
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		$ 10,675,000		$ 1,617,000
Consumer Real Estate Portfolio [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Number of Contracts | Tdr	2		2
Default payment of troubled restructuring, pre-modification	$ 5,100,000		$ 5,100,000
Default payment of troubled restructuring, post-modification	$ 4,300,000		$ 4,300,000