Loans and Allowance for Loan Losses - Summary of Activities of the Loan Collateral in Process of Foreclosure Related to Recreation and Medallion Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Loans and Leases Receivable Disclosure [Line Items]
Loans collateral in process of foreclosure - beginning balance	$ 26,974		$ 49,039	$ 37,430	[1]	$ 54,560
Transfer from loans, net	2,862		2,482	8,659		13,145
Sales	(1,943)		(3,194)	(8,456)		(7,713)
Cash payments received	(2,243)		(4,525)	(9,496)		(8,948)
Collateral valuation adjustments	(1,319)		(1,258)	(3,806)		(8,500)
Loans collateral in process of foreclosure - ending balance	24,331	[1]	42,544	24,331	[1]	42,544
Recreation [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collateral in process of foreclosure - beginning balance	878		882	1,720		1,432
Transfer from loans, net	2,862		2,085	8,391		8,118
Sales	(1,399)		(1,554)	(5,797)		(5,842)
Cash payments received	0		0	0		0
Collateral valuation adjustments	(1,225)		(640)	(3,198)		(2,935)
Loans collateral in process of foreclosure - ending balance	1,116		773	1,116		773
Medallion [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collateral in process of foreclosure - beginning balance	26,096		48,157	35,710		53,128
Transfer from loans, net	0		397	268		5,027
Sales	(544)		(1,640)	(2,659)		(1,871)
Cash payments received	(2,243)		(4,525)	(9,496)		(8,948)
Collateral valuation adjustments	(94)		(618)	(608)		(5,565)
Loans collateral in process of foreclosure - ending balance	$ 23,215		$ 41,771	$ 23,215		$ 41,771

[1] Includes financed sales of this collateral to third parties that are reported separately from the loan portfolio, of $7.8 million as of September 30, 2022 and $7.4 million as of December 31, 2021