Loans and Allowance for Credit 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, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Loans and Leases Receivable Disclosure [Line Items]
Loans collateral in process of foreclosure - beginning balance	$ 16,803		$ 26,974	$ 21,819	[1]	$ 37,430
Transfer from loans, net	4,730		2,862	15,384		8,659
Sales	1,197		(1,943)	6,543		(8,456)
Cash payments received	2,102		(2,243)	8,064		(9,496)
Collateral valuation adjustments	2,311		(1,319)	6,673		(3,806)
Loans collateral in process of foreclosure - ending balance	15,923	[1]	24,331	15,923	[1]	24,331
Recreation [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collateral in process of foreclosure - beginning balance	729		878	1,376		1,720
Transfer from loans, net	4,730		2,862	13,078		8,391
Sales	1,080		(1,399)	5,858		(5,797)
Cash payments received	163		0	291		0
Collateral valuation adjustments	2,281		(1,225)	6,370		(3,198)
Loans collateral in process of foreclosure - ending balance	1,935		1,116	1,935		1,116
Medallion [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collateral in process of foreclosure - beginning balance	16,074		26,096	20,443		35,710
Transfer from loans, net	0		0	2,306		268
Sales	117		(544)	685		(2,659)
Cash payments received	1,939		(2,243)	7,773		(9,496)
Collateral valuation adjustments	30		(94)	303		(608)
Loans collateral in process of foreclosure - ending balance	$ 13,988		$ 23,215	$ 13,988		$ 23,215

[1] Includes financed sales of this collateral to third parties that are reported separately from the loan portfolio, of $6.2 million as of September 30, 2023 and $7.5 million as of December 31, 2022.