Loans and Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		$ 50,166	[1]	$ 57,548
Total charge-offs		(39,845)		(32,948)
Total recoveries		23,465		20,944
Net charge-offs	[2]	(16,380)		(12,004)
Provision for loan losses		30,059		4,622		$ 69,817
Allowance for loan losses - ending balance		63,845	[1]	50,166	[1]	$ 57,548
Recreation [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		32,435
Total charge-offs		(27,055)		(14,712)
Total recoveries		13,785		12,131
Allowance for loan losses - ending balance		41,966		32,435
Home Improvement [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		7,356
Total charge-offs		(6,393)		(2,949)
Total recoveries		2,761		2,398
Allowance for loan losses - ending balance		11,340		7,356
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		1,141
Total charge-offs		47		0
Total recoveries		6,083		0
Allowance for loan losses - ending balance		1,049		1,141
Medallion [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses - beginning balance		9,234
Total charge-offs		(314)		(15,287)
Total recoveries		6,872		6,415
Allowance for loan losses - ending balance		$ 9,490		$ 9,234

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

[2] As of December 31, 2022, cumulative charge-offs of loans and loan collateral in process of foreclosure in the medallion loan portfolio were $244.2 million, some of which represent collection opportunities for the Company.