Loans and Allowance for credit Losses - Schedule of Activity of Gross Loans (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		$ 1,882,585
Charge-offs, net	[1]	(31,132)		$ (16,380)
Transfer to loan collateral in process of foreclosure, net		(21,181)		(12,791)
Amortization of origination costs		(9,588)		(8,707)		$ (7,996)
Paid-in-kind interest		1,636		724		814
Gross loans, ending balance		2,176,412		1,882,585
Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		1,146,095
Transfer to loan collateral in process of foreclosure, net		(18,875)		(12,444)
Gross loans, ending balance		1,292,591		1,146,095
Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		628,877
Gross loans, ending balance		764,069		628,877
Taxi Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		13,571
Transfer to loan collateral in process of foreclosure, net		(2,306)	[2]	(347)	[3]
Gross loans, ending balance		3,663		13,571
Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		572
Charge-offs, net		0		0
Gross loans, ending balance		553		572
Bank Holding Company Accounting [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		1,916,953		1,488,924
Loan originations		960,047		983,908
Principal payments, sales, maturities, and recoveries		(579,657)		(511,602)
Charge-offs, net		(67,668)		(39,845)
Transfer to loan collateral in process of foreclosure, net		(21,181)		(12,791)
Amortization of origination costs		(9,588)		(8,707)
Amortization of loan premium				(535)
FASB origination costs, net		15,344		16,877
Paid-in-kind interest		1,636		724
Gross loans, ending balance		2,215,886		1,916,953		1,488,924
Bank Holding Company Accounting [Member] | Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		1,183,512		961,320
Loan originations		447,039		513,062
Principal payments, sales, maturities, and recoveries		(231,158)		(259,326)
Charge-offs, net		(50,512)		(27,055)
Transfer to loan collateral in process of foreclosure, net		(18,875)		(12,444)
Amortization of origination costs		(12,270)		(10,470)
Amortization of loan premium				(213)
FASB origination costs, net		18,490		18,638
Paid-in-kind interest		0		0
Gross loans, ending balance		1,336,226		1,183,512		961,320
Bank Holding Company Accounting [Member] | Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		626,399		436,772
Loan originations		357,394		392,543
Principal payments, sales, maturities, and recoveries		(209,894)		(196,203)
Charge-offs, net		(12,308)		(6,393)
Transfer to loan collateral in process of foreclosure, net		0		0
Amortization of origination costs		2,668		1,763
Amortization of loan premium				(322)
FASB origination costs, net		(3,642)		(1,761)
Paid-in-kind interest		0		0
Gross loans, ending balance		760,617		626,399		436,772
Bank Holding Company Accounting [Member] | Commercial [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		92,899		76,696
Loan originations		34,850		28,172
Principal payments, sales, maturities, and recoveries		(13,389)		(6,610)
Charge-offs, net		(1,019)		(6,083)
Transfer to loan collateral in process of foreclosure, net		0		0
Amortization of origination costs		14		0
Amortization of loan premium				0
FASB origination costs, net		(164)		0
Paid-in-kind interest		1,636		724
Gross loans, ending balance		114,827		92,899		76,696
Bank Holding Company Accounting [Member] | Taxi Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		13,571		14,046
Loan originations		2,426		605
Principal payments, sales, maturities, and recoveries		(6,859)		(419)
Charge-offs, net		(3,829)		(314)
Transfer to loan collateral in process of foreclosure, net		(2,306)		(347)
Amortization of origination costs		0		0
Amortization of loan premium				0
FASB origination costs, net		660		0
Paid-in-kind interest		0		0
Gross loans, ending balance		3,663		13,571		14,046
Bank Holding Company Accounting [Member] | Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		572		90
Loan originations		118,338		49,526
Principal payments, sales, maturities, and recoveries		(118,357)		(49,044)
Charge-offs, net		0		0
Transfer to loan collateral in process of foreclosure, net		0		0
Amortization of origination costs		0		0
Amortization of loan premium				0
FASB origination costs, net		0		0
Paid-in-kind interest		0		0
Gross loans, ending balance		$ 553		$ 572		$ 90

[1] As of December 31, 2023, cumulative net charge-offs of loans and loan collateral in process of foreclosure in the taxi medallion portfolio were $176.8 million, including $107.9 million related to loans secured by New York taxi medallions, some of which may represent collection opportunities for the Company.

[2] As of December 31, 2023, taxi medallion loans in the process of foreclosure included 333 taxi medallions in the New York market, 206 taxi medallions in the Chicago market, 31 taxi medallions in the Newark market, and 31 taxi medallions in various other markets.

[3] As of December 31, 2022, taxi medallion loans in the process of foreclosure included 452 taxi medallions in the New York market, 335 taxi medallions in the Chicago market, 54 taxi medallions in the Newark market, and 39 taxi medallions in various other markets.