Loans and Allowance for Credit Losses - Schedule of Activity of Gross Loans and Loans Held for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended
	Jun. 30, 2025		Mar. 31, 2025		Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025		Jun. 30, 2024
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			$ 2,362,796				$ 2,362,796
Charge-offs	$ (21,224)		(24,646)		$ (18,690)	$ (22,999)
Amortization of origination fees and costs, net							(4,915)		$ (4,298)
Paid-in-kind interest							485		1,263
Gross loans, ending balance	2,412,561						2,412,561
Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			1,543,243				1,543,243
Charge-offs	(16,273)		(20,274)		(14,627)	(18,101)
Gross loans, ending balance	1,546,252						1,546,252
Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			827,211				827,211
Charge-offs	(4,951)		(4,227)		(4,063)	(4,898)
Gross loans, ending balance	803,535						803,535
Commercial [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			111,273				111,273
Charge-offs	0		(130)		0	0
Gross loans, ending balance	121,415						121,415
Taxi Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			1,909				1,909
Charge-offs	0	[1]	(15)	[1]	0	0
Gross loans, ending balance	1,564						1,564
Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			7,386				7,386
Gross loans, ending balance	12,285						12,285
Bank Holding Company Accounting [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	2,486,433	[2]	2,491,022	[2]	2,228,426	2,215,886	2,491,022	[2]	2,215,886
Loan originations	375,047				309,091		656,695		482,178
Principal receipts, sales, and maturities	(347,725)				(132,192)		(603,244)		(265,550)
Charge-offs	(21,224)				(18,690)		(45,870)		(41,689)
Transfer to loan collateral in process of foreclosure, net	(8,512)				(5,669)		(14,995)		(11,094)
Amortization of origination fees and costs, net	(2,579)				(2,291)		(4,915)		(4,298)
Origination fees and costs, net	3,375				6,260		5,873		8,894
Paid-in-kind interest	236				655		485		1,263
Gross loans, ending balance	2,485,051	[2]	2,486,433	[2]	2,385,590	2,228,426	2,485,051	[2]	2,385,590
Bank Holding Company Accounting [Member] | Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	1,545,844	[2]	1,543,243	[2]	1,365,165	1,336,226	1,543,243	[2]	1,336,226
Loan originations	142,789				209,563		229,622		315,328
Principal receipts, sales, and maturities	(118,149)				(61,553)		(175,562)		(115,589)
Charge-offs	(16,273)				(14,627)		(36,547)		(32,728)
Transfer to loan collateral in process of foreclosure, net	(8,512)				(5,669)		(14,995)		(11,094)
Amortization of origination fees and costs, net	(3,746)				(3,214)		(7,227)		(6,166)
Origination fees and costs, net	4,299				7,763		7,718		11,451
Paid-in-kind interest	0				0		0		0
Gross loans, ending balance	1,546,252	[2]	1,545,844	[2]	1,497,428	1,365,165	1,546,252	[2]	1,497,428
Bank Holding Company Accounting [Member] | Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	812,381	[2]	827,211	[2]	752,262	760,617	827,211	[2]	760,617
Loan originations	54,253				67,990		103,049		119,566
Principal receipts, sales, and maturities	(58,380)				(42,492)		(117,991)		(97,409)
Charge-offs	(4,951)				(4,063)		(9,178)		(8,961)
Transfer to loan collateral in process of foreclosure, net	0				0		0		0
Amortization of origination fees and costs, net	1,156				913		2,289		1,851
Origination fees and costs, net	(924)				(1,426)		(1,845)		(2,480)
Paid-in-kind interest	0				0		0		0
Gross loans, ending balance	803,535	[2]	812,381	[2]	773,184	752,262	803,535	[2]	773,184
Bank Holding Company Accounting [Member] | Commercial [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	116,059	[2]	111,273	[2]	106,570	114,827	111,273	[2]	114,827
Loan originations	9,368				7,000		19,075		7,000
Principal receipts, sales, and maturities	(4,259)				(3,961)		(9,311)		(12,833)
Charge-offs	0				0		(130)		0
Transfer to loan collateral in process of foreclosure, net	0				0		0		0
Amortization of origination fees and costs, net	11				10		23		17
Origination fees and costs, net	0				(77)		0		(77)
Paid-in-kind interest	236				655		485		1,263
Gross loans, ending balance	121,415	[2]	116,059	[2]	110,197	106,570	121,415	[2]	110,197
Bank Holding Company Accounting [Member] | Taxi Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	1,650	[2]			3,560
Loan originations	0				250
Principal receipts, sales, and maturities	(86)				(328)
Charge-offs	0				0
Transfer to loan collateral in process of foreclosure, net	0				0
Amortization of origination fees and costs, net	0				0
Origination fees and costs, net	0				0
Paid-in-kind interest	0				0
Gross loans, ending balance	1,564	[2]	1,650	[2]	3,482	3,560	1,564	[2]	3,482
Bank Holding Company Accounting [Member] | Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			1,909	[2]		3,663	1,909	[2]	3,663
Loan originations							72		250
Principal receipts, sales, and maturities							(402)		(431)
Charge-offs							(15)		0
Transfer to loan collateral in process of foreclosure, net							0		0
Amortization of origination fees and costs, net							0		0
Origination fees and costs, net							0		0
Paid-in-kind interest							0		0
Gross loans, ending balance	1,564	[2]			3,482		1,564	[2]	3,482
Bank Holding Company Accounting [Member] | Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	10,499	[2]	7,386	[2]	869	553	7,386	[2]	553
Loan originations	168,637				24,288		304,877		40,034
Principal receipts, sales, and maturities	(166,851)				(23,858)		(299,978)		(39,288)
Charge-offs	0				0		0		0
Transfer to loan collateral in process of foreclosure, net	0				0		0		0
Amortization of origination fees and costs, net	0				0		0		0
Origination fees and costs, net	0				0		0		0
Paid-in-kind interest	0				0		0		0
Gross loans, ending balance	$ 12,285	[2]	$ 10,499	[2]	$ 1,299	$ 869	$ 12,285	[2]	$ 1,299

[1] As of June 30, 2025, cumulative net charge-offs of loans and loan collateral in process of foreclosure in the taxi medallion portfolio were $161.5 million, including $95.2 million related to loans secured by New York taxi medallions, some of which may represent collection opportunities for the Company.

[2] Includes loans held for sale and loans held for investment.