Loans and Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - beginning balance	[1]	$ 84,235	$ 63,845
Total charge-offs		(22,999)	(18,097)
Total recoveries		5,390	6,782
Charge-offs, net	[2]	(17,609)	(11,315)
Provision for credit losses		17,201	4,038
Allowance for credit losses - ending balance	[3]	83,827	70,280
Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - ending balance		0	13,712
Recreation [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - beginning balance		57,532
Total charge-offs		(18,101)	(12,590)
Total recoveries		3,548	2,771
Allowance for credit losses - ending balance		60,011
Home Improvement [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - beginning balance		21,019
Total charge-offs		(4,898)	(1,914)
Total recoveries		911	632
Allowance for credit losses - ending balance		17,930
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - beginning balance		4,148
Total charge-offs		0	0
Total recoveries		20	10
Allowance for credit losses - ending balance		4,384
Taxi Medallion [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - beginning balance		1,536
Total charge-offs		0	(3,593)
Total recoveries		911	$ 3,369
Allowance for credit losses - ending balance		$ 1,502

[1] 2023 beginning balance represents allowance prior to the adoption of ASU 2016-13.

[2] As of March 31, 2024, cumulative net charge-offs of loans and loan collateral in process of foreclosure in the taxi medallion loan portfolio were $173.7 million, including $105.5 million related to loans secured by New York City taxi medallions, some of which may represent collection opportunities for the Company.

[3] As of March 31, 2024 and March 31, 2023, there were no allowance for credit losses and net charge-offs related to the strategic partnership loans.