Loans and Allowance for Loan Losses - Schedule of Activity of Gross Loans (Detail) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]			$ 1,461,622,000
Net recoveries (charge-offs)	[2]	$ 707,000	$ (10,181,000)	(2,013,000)	$ (12,938,000)
Transfer to loan collateral in process of foreclosure, net		(2,757,000)	(6,913,000)	(5,797,000)	(10,663,000)
Amortization of origination costs				(4,670,000)	(3,723,000)
Paid-in-kind interest				347,000	495,000
Gross loans, ending balance		1,702,831,000		1,702,831,000
Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]			931,859,000
Transfer to loan collateral in process of foreclosure, net		(2,618,000)	(2,980,000)	(5,529,000)	(6,033,000)
Gross loans, ending balance		1,062,573,000		1,062,573,000
Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]			438,931,000
Gross loans, ending balance		528,585,000		528,585,000
Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]			14,046,000
Transfer to loan collateral in process of foreclosure, net		(139,000)	(3,933,000)	(268,000)	(4,630,000)
Gross loans, ending balance		14,152,000		14,152,000
Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]			90,000
Net recoveries (charge-offs)				0	0
Gross loans, ending balance		593,000		593,000
Bank Holding Company Accounting [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		1,569,441,000	1,259,215,000	1,488,924,000	1,229,838,000
Loan originations		304,953,000	210,944,000	518,680,000	358,954,000
Principal payments, sales, maturities, and recoveries		133,999,000	(106,700,000)	(258,054,000)	(215,817,000)
Net recoveries (charge-offs)		6,182,000	(16,249,000)	(13,968,000)	23,097,000
Transfer to loan collateral in process of foreclosure, net		2,757,000	(6,913,000)	(5,797,000)	(10,663,000)
Amortization of origination costs		(2,551,000)	(2,067,000)	4,670,000	(3,723,000)
Amortization of loan premium		150,000	1,695,000	(300,000)	(1,882,000)
FASB origination costs		5,691,000	3,862,000	9,459,000	6,462,000
Paid-in-kind interest		175,000	170,000	347,000	495,000
Gross loans, ending balance		1,734,621,000	1,340,567,000	1,734,621,000	1,340,567,000
Bank Holding Company Accounting [Member] | Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		1,004,091,000	822,932,000	961,320,000	792,686,000
Loan originations		170,207,000	134,467,000	284,613,000	228,317,000
Principal payments, sales, maturities, and recoveries		73,114,000	(67,084,000)	(138,230,000)	(123,043,000)
Net recoveries (charge-offs)		5,074,000	(2,672,000)	(10,141,000)	(7,725,000)
Transfer to loan collateral in process of foreclosure, net		2,618,000	(2,980,000)	(5,529,000)	(6,033,000)
Amortization of origination costs		(2,931,000)	(2,477,000)	5,370,000	4,639,000
Amortization of loan premium		60,000	60,000	(120,000)	(101,000)
FASB origination costs		6,169,000	4,080,000	10,127,000	6,744,000
Paid-in-kind interest		0	0	0	0
Gross loans, ending balance		1,096,670,000	886,206,000	1,096,670,000	886,206,000
Bank Holding Company Accounting [Member] | Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		473,408,000	342,121,000	436,772,000	334,033,000
Loan originations		105,172,000	62,992,000	194,992,000	111,051,000
Principal payments, sales, maturities, and recoveries		51,006,000	(36,171,000)	(103,170,000)	(75,807,000)
Net recoveries (charge-offs)		1,108,000	(786,000)	(2,168,000)	(1,467,000)
Transfer to loan collateral in process of foreclosure, net		0	0	0	0
Amortization of origination costs		380,000	410,000	700,000	907,000
Amortization of loan premium		90,000	90,000	(180,000)	(166,000)
FASB origination costs		(478,000)	(219,000)	668,000	(294,000)
Paid-in-kind interest		0	0	0	0
Gross loans, ending balance		526,278,000	368,257,000	526,278,000	368,257,000
Bank Holding Company Accounting [Member] | Commercial [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		77,867,000	58,854,000	76,696,000	65,327,000
Loan originations		19,272,000	11,059,000	23,672,000	15,216,000
Principal payments, sales, maturities, and recoveries		386,000	(564,000)	(2,203,000)	(11,541,000)
Net recoveries (charge-offs)		0	0	(1,584,000)	0
Transfer to loan collateral in process of foreclosure, net		0	0	0	0
Amortization of origination costs		0	0	0	11,000
Amortization of loan premium		0	0	0	0
FASB origination costs		0	1,000	0	12,000
Paid-in-kind interest		175,000	170,000	347,000	495,000
Gross loans, ending balance		96,928,000	69,520,000	96,928,000	69,520,000
Bank Holding Company Accounting [Member] | Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		13,849,000	35,250,000	14,046,000	37,768,000
Loan originations		472,000	0	564,000	0
Principal payments, sales, maturities, and recoveries		30,000	(467,000)	(115,000)	(1,102,000)
Net recoveries (charge-offs)		0	(12,791,000)	(75,000)	(13,905,000)
Transfer to loan collateral in process of foreclosure, net		139,000	(3,933,000)	(268,000)	(4,630,000)
Amortization of origination costs		0	0	0	(2,000)
Amortization of loan premium		0	(1,545,000)	0	(1,615,000)
FASB origination costs		0	0	0	0
Paid-in-kind interest		0	0	0	0
Gross loans, ending balance		14,152,000	16,514,000	14,152,000	16,514,000
Bank Holding Company Accounting [Member] | Strategic Partnership [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		226,000	58,000	90,000	24,000
Loan originations		9,830,000	2,426,000	14,839,000	4,370,000
Principal payments, sales, maturities, and recoveries		9,463,000	(2,414,000)	(14,336,000)	(4,324,000)
Net recoveries (charge-offs)		0	0	0	0
Transfer to loan collateral in process of foreclosure, net		0	0	0	0
Amortization of origination costs		0	0	0	0
Amortization of loan premium		0	0	0	0
FASB origination costs		0	0	0	0
Paid-in-kind interest		0	0	0	0
Gross loans, ending balance		$ 593,000	$ 70,000	$ 593,000	$ 70,000

[1] Excludes loan premiums of $0.5 million and $26.8 million of capitalized loan origination costs.

[2] As of June 30, 2022, cumulative net charge-offs of loans and loan collateral in process of foreclosure in the medallion loan portfolio were $252.1 million, some of which may represent collection opportunities for the Company.