Loans and Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		$ 50,166	$ 57,548
Total charge-offs		7,786	6,848
Total recoveries		5,066	4,090
Charge-offs	[1]	2,720	2,758
Provision for loan losses		3,240	3,019
Allowance for loan losses - ending balance	[2]	50,686	57,809
Recreation [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		32,435
Total charge-offs		5,067	5,053
Total recoveries		3,510	2,469
Allowance for loan losses - ending balance		32,558
Home Improvement [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		7,356
Total charge-offs		1,060	681
Total recoveries		559	432
Allowance for loan losses - ending balance		8,059
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		1,141
Total charge-offs		1,584
Total recoveries		34
Allowance for loan losses - ending balance		828
Medallion [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		9,234
Total charge-offs		75	1,114
Total recoveries		963	$ 1,189
Allowance for loan losses - ending balance		$ 9,241

[1] As of March 31, 2022, cumulative net charge-offs of loans and loan collateral in process of foreclosure in the medallion loan portfolio were $257.0 million, some of which may represent collection opportunities for the Company.

[2] As of March 31, 2022 and March 31, 2021, there was no allowance for loan losses and net charge-offs related to the strategic partnership loans.