Loans and Allowance for Loan Losses - Schedule of Activity of Gross Loans (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]	$ 1,136,694
Charge-offs, net	[2]	(8,577)	$ (12,876)
Transfer to loan collateral in process of foreclosure, net		(6,938)	(9,096)
Amortization of origination costs		(1,304)	(1,151)
Paid-in-kind interest		293	237
Gross loans, ending balance	[3]	1,159,406
Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]	689,810
Transfer to loan collateral in process of foreclosure, net		(4,779)	(3,391)
Gross loans, ending balance	[3]	711,223
Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]	250,830
Gross loans, ending balance	[3]	259,432
Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance	[1]	126,287
Transfer to loan collateral in process of foreclosure, net		(2,159)	(5,705)
Gross loans, ending balance	[3]	120,494
Bank Holding Company Accounting [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		1,160,855	1,017,882
Loan originations		105,283	90,779
Principal payments		(67,369)	(62,240)
Charge-offs, net		(8,577)	(12,876)
Transfer to loan collateral in process of foreclosure, net		(6,938)	(9,096)
Amortization of origination costs		(1,304)	(1,151)
Amortization of loan premium		(329)	(1,092)
FASB origination costs		1,865	1,757
Paid-in-kind interest		293	237
Gross loans, ending balance		1,183,779	1,024,200
Bank Holding Company Accounting [Member] | Recreation [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		713,332	587,038
Loan originations		69,643	63,632
Principal payments		(37,070)	(33,373)
Charge-offs, net		(6,382)	(4,929)
Transfer to loan collateral in process of foreclosure, net		(4,779)	(3,391)
Amortization of origination costs		(1,728)	(1,438)
Amortization of loan premium		(52)	(70)
FASB origination costs		2,211	2,530
Gross loans, ending balance		735,175	609,999
Bank Holding Company Accounting [Member] | Home Improvement [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		247,324	183,155
Loan originations		33,465	26,647
Principal payments		(24,225)	(15,849)
Charge-offs, net		(636)	(159)
Amortization of origination costs		441	346
Amortization of loan premium		(86)	(109)
FASB origination costs		(384)	(756)
Gross loans, ending balance		255,899	193,275
Bank Holding Company Accounting [Member] | Commercial [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		69,767	64,083
Loan originations		2,175	500
Principal payments		(3,999)	(9,580)
Amortization of origination costs		2	29
FASB origination costs		19	(58)
Paid-in-kind interest		293	237
Gross loans, ending balance		68,257	55,211
Bank Holding Company Accounting [Member] | Medallion [Member]
Schedule Of Gross Real Estate And Loan Activity [Line Items]
Gross loans, beginning balance		130,432	183,606
Principal payments		(2,075)	(3,438)
Charge-offs, net		(1,559)	(7,788)
Transfer to loan collateral in process of foreclosure, net		(2,159)	(5,705)
Amortization of origination costs		(19)	(88)
Amortization of loan premium		(191)	(913)
FASB origination costs		19	41
Gross loans, ending balance		$ 124,448	$ 165,715

[1] Excludes loan premiums of $5,758 resulting from purchase price accounting and $18,403 of capitalized loan origination costs.

[2] As of March 31, 2020, cumulative net charge-offs of loans and loan collateral in process of foreclosure in the medallion loan portfolio were $243,428, representing collection opportunities for the Company.

[3] Excludes loan premiums of $5,429 resulting from purchase price accounting and $18,944 of capitalized loan origination costs.