Loans and Allowance for Credit Losses - Schedule of Activity of Gross Loans (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		$ 2,176,412
Charge-offs, net	[1]	(17,609)	$ (11,315)
Transfer to loan collateral in process of foreclosure, net		(5,425)	(6,504)
Amortization of origination costs		(2,007)	(2,173)
Paid-in-kind interest		608	264
Gross loans, ending balance		2,188,640
Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		1,292,591
Transfer to loan collateral in process of foreclosure, net		(5,425)	(4,357)
Gross loans, ending balance		1,320,794
Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		764,069
Gross loans, ending balance		755,831
Taxi Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		3,663
Transfer to loan collateral in process of foreclosure, net		0	(2,147)
Gross loans, ending balance		3,560
Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		553
Charge-offs, net		0	0
Gross loans, ending balance		869
Bank Holding Company Accounting [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		2,215,886	1,916,953
Loan originations		173,087	227,291
Principal payments, sales, maturities, and recoveries		(144,208)	(137,109)
Charge-offs, net		(22,999)	(18,097)
Transfer to loan collateral in process of foreclosure, net		5,425	(6,504)
Amortization of origination costs		(2,007)	(2,173)
FASB origination costs, net		2,634	3,555
Paid-in-kind interest		608	264
Gross loans, ending balance		2,228,426	1,984,180
Bank Holding Company Accounting [Member] | Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		1,336,226	1,183,512
Loan originations		105,765	101,681
Principal payments, sales, maturities, and recoveries		(64,886)	(56,217)
Charge-offs, net		(18,101)	(12,590)
Transfer to loan collateral in process of foreclosure, net		5,425	(4,357)
Amortization of origination costs		(2,952)	(2,759)
FASB origination costs, net		3,688	4,110
Paid-in-kind interest		0	0
Gross loans, ending balance		1,365,165	1,213,380
Bank Holding Company Accounting [Member] | Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		760,617	626,399
Loan originations		51,576	94,981
Principal payments, sales, maturities, and recoveries		(54,917)	(49,855)
Charge-offs, net		(4,898)	(1,914)
Transfer to loan collateral in process of foreclosure, net		0	0
Amortization of origination costs		938	586
FASB origination costs, net		(1,054)	(555)
Paid-in-kind interest		0	0
Gross loans, ending balance		752,262	669,642
Bank Holding Company Accounting [Member] | Commercial [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		114,827	92,899
Loan originations		0	3,000
Principal payments, sales, maturities, and recoveries		(8,872)	(834)
Charge-offs, net		0	0
Transfer to loan collateral in process of foreclosure, net		0	0
Amortization of origination costs		7	0
FASB origination costs, net		0	0
Paid-in-kind interest		608	264
Gross loans, ending balance		106,570	95,329
Bank Holding Company Accounting [Member] | Taxi Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		3,663	13,571
Loan originations		0	623
Principal payments, sales, maturities, and recoveries		(103)	(4,395)
Charge-offs, net		0	(3,593)
Transfer to loan collateral in process of foreclosure, net		0	(2,147)
Amortization of origination costs		0	0
FASB origination costs, net		0	0
Paid-in-kind interest		0	0
Gross loans, ending balance		3,560	4,059
Bank Holding Company Accounting [Member] | Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		553	572
Loan originations		15,746	27,006
Principal payments, sales, maturities, and recoveries		(15,430)	(25,808)
Charge-offs, net		0	0
Transfer to loan collateral in process of foreclosure, net		0	0
Amortization of origination costs		0	0
FASB origination costs, net		0	0
Paid-in-kind interest		0	0
Gross loans, ending balance		$ 869	$ 1,770

[1] 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.