Loans and Allowance for Credit Losses - Schedule of Activity of Gross Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			$ 2,215,886
Charge-offs	$ (18,690)	$ (12,862)	(41,689)	$ (30,959)
Transfer to loan collateral in process of foreclosure, net	(5,669)	(4,150)	(11,094)	(10,654)
Amortization of origination fees, net			(4,298)	(4,667)
Paid-in-kind interest			1,263	644
Gross loans, ending balance	2,385,590	2,156,998	2,385,590	2,156,998
Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			1,336,226
Charge-offs	(14,627)	(9,166)	(32,728)	(21,756)
Transfer to loan collateral in process of foreclosure, net	(5,669)	(3,991)	(11,094)	(8,348)
Gross loans, ending balance	1,497,428		1,497,428
Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			760,617
Charge-offs	(4,063)	(2,575)	(8,961)	(4,489)
Gross loans, ending balance	773,184		773,184
Commercial [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			114,827
Charge-offs	0	(900)	0	(900)
Gross loans, ending balance	110,197		110,197
Taxi Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			3,663
Charge-offs	0	(221)	0	(3,814)
Transfer to loan collateral in process of foreclosure, net	0	(159)	0	(2,306)
Gross loans, ending balance	3,482		3,482
Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			553
Gross loans, ending balance	1,299		1,299
Bank Holding Company Accounting [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	2,228,426	1,984,180	2,215,886	1,916,953
Loan originations	309,091	346,266	482,178	573,557
Principal receipts, sales, and maturities	(132,192)	(160,879)	(265,550)	(297,988)
Charge-offs	(18,690)	(12,862)	(41,689)	(30,959)
Transfer to loan collateral in process of foreclosure, net	(5,669)	(4,150)	(11,094)	(10,654)
Amortization of origination fees, net	(2,291)	(2,494)	(4,298)	(4,667)
Origination costs, net	6,260	6,557	8,894	10,112
Paid-in-kind interest	655	380	1,263	644
Gross loans, ending balance	2,385,590	2,156,998	2,385,590	2,156,998
Bank Holding Company Accounting [Member] | Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	1,365,165	1,213,380	1,336,226	1,183,512
Loan originations	209,563	190,007	315,328	291,688
Principal receipts, sales, and maturities	(61,553)	(63,463)	(115,589)	(119,680)
Charge-offs	(14,627)	(9,166)	(32,728)	(21,756)
Transfer to loan collateral in process of foreclosure, net	(5,669)	(3,991)	(11,094)	(8,348)
Amortization of origination fees, net	(3,214)	(3,159)	(6,166)	(5,918)
Origination costs, net	7,763	7,506	11,451	11,616
Paid-in-kind interest	0	0	0	0
Gross loans, ending balance	1,497,428	1,331,114	1,497,428	1,331,114
Bank Holding Company Accounting [Member] | Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	752,262	669,642	760,617	626,399
Loan originations	67,990	117,035	119,566	212,016
Principal receipts, sales, and maturities	(42,492)	(55,350)	(97,409)	(105,205)
Charge-offs	(4,063)	(2,575)	(8,961)	(4,489)
Transfer to loan collateral in process of foreclosure, net	0	0	0	0
Amortization of origination fees, net	913	665	1,851	1,251
Origination costs, net	(1,426)	(949)	(2,480)	(1,504)
Paid-in-kind interest	0	0	0	0
Gross loans, ending balance	773,184	728,468	773,184	728,468
Bank Holding Company Accounting [Member] | Commercial [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	106,570	95,329	114,827	92,899
Loan originations	7,000	4,750	7,000	7,750
Principal receipts, sales, and maturities	(3,961)	(6,922)	(12,833)	(7,756)
Charge-offs	0	(900)	0	(900)
Transfer to loan collateral in process of foreclosure, net	0	0	0	0
Amortization of origination fees, net	10	0	17	0
Origination costs, net	(77)	0	(77)	0
Paid-in-kind interest	655	380	1,263	644
Gross loans, ending balance	110,197	92,637	110,197	92,637
Bank Holding Company Accounting [Member] | Taxi Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	3,560	4,059	3,663
Loan originations	250	1,300
Principal receipts, sales, and maturities	(328)	(1,531)
Charge-offs	0	(221)
Transfer to loan collateral in process of foreclosure, net	0	(159)
Amortization of origination fees, net	0	0
Origination costs, net	0	0
Paid-in-kind interest	0	0
Gross loans, ending balance	3,482	3,448	3,482	3,448
Bank Holding Company Accounting [Member] | Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance			3,663	13,571
Loan originations			250	1,923
Principal receipts, sales, and maturities			(431)	(5,926)
Charge-offs			0	(3,814)
Transfer to loan collateral in process of foreclosure, net			0	(2,306)
Amortization of origination fees, net			0
Origination costs, net			0
Paid-in-kind interest			0	0
Gross loans, ending balance	3,482	3,448	3,482	3,448
Bank Holding Company Accounting [Member] | Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	869	1,770	553	572
Loan originations	24,288	33,174	40,034	60,180
Principal receipts, sales, and maturities	(23,858)	(33,613)	(39,288)	(59,421)
Charge-offs	0	0	0	0
Transfer to loan collateral in process of foreclosure, net	0	0	0	0
Amortization of origination fees, net	0	0	0	0
Origination costs, net	0	0	0	0
Paid-in-kind interest	0	0	0	0
Gross loans, ending balance	$ 1,299	$ 1,331	$ 1,299	$ 1,331