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Loans and Allowance for Loan Losses - Schedule of Activity of Gross Loans (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance | [1] | $ 1,136,694,000 |  |  |  |  |
Charge-offs, net | [2] | (58,362,000) |  | $ (37,688,000) |  |  |
Transfer to loan collateral in process of foreclosure, net |  | (47,274,000) |  | (31,348,000) |  |  |
Amortization of origination costs |  | (6,022,000) |  | (4,952,000) |  | $ (3,132,000) | [3]
Paid-in-kind interest |  | 1,188,000 |  | 834,000 |  | 1,869,000 | [3]
Loans transferred to other foreclosed property |  | 1,800,000 |  |  |  |  |
Gross loans, ending balance |  | 1,205,776,000 | [4] | 1,136,694,000 | [1] |  |
Recreation [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance | [1] | 689,810,000 |  |  |  |  |
Transfer to loan collateral in process of foreclosure, net |  | (14,871,000) |  | (14,512,000) |  |  |
Gross loans, ending balance |  | 767,374,000 | [4] | 689,810,000 | [1] |  |
Home Improvement [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance | [1] | 250,830,000 |  |  |  |  |
Gross loans, ending balance |  | 336,885,000 | [4] | 250,830,000 | [1] |  |
Medallion [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance | [1] | 126,287,000 |  |  |  |  |
Transfer to loan collateral in process of foreclosure, net |  | (32,403,000) |  | (16,836,000) |  |  |
Gross loans, ending balance |  | 36,153,000 | [4] | 126,287,000 | [1] |  |
Strategic Partnership [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Charge-offs, net |  | 0 |  |  |  |  |
Gross loans, ending balance | [4] | 24,000 |  |  |  |  |
Bank Holding Company Accounting [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance |  | 1,160,855,000 |  | 1,017,882,000 |  |  |
Loan originations |  | 497,221,000 |  | 462,093,000 |  |  |
Principal payments, sales, and maturities |  | (321,831,000) |  | (251,653,000) |  |  |
Charge-offs, net |  | (58,362,000) |  | (37,688,000) |  |  |
Transfer to loan collateral in process of foreclosure, net |  | (47,254,000) |  | (31,348,000) |  |  |
Amortization of origination costs |  | (6,022,000) |  | (4,952,000) |  |  |
Amortization of loan premium |  | (3,042,000) |  | (3,289,000) |  |  |
FASB origination costs, net |  | 8,885,000 |  | 8,976,000 |  |  |
Paid-in-kind interest |  | 1,188,000 |  | 834,000 |  |  |
Loans transferred to other foreclosed property |  | (1,800,000) |  |  |  |  |
Gross loans, ending balance |  | 1,229,838,000 |  | 1,160,855,000 |  | 1,017,882,000 |
Bank Holding Company Accounting [Member] | Recreation [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance |  | 713,332,000 |  | 587,038,000 |  |  |
Loan originations |  | 294,885,000 |  | 301,403,000 |  |  |
Principal payments, sales, and maturities |  | (187,989,000) |  | (146,873,000) |  |  |
Charge-offs, net |  | (14,457,000) |  | (17,419,000) |  |  |
Transfer to loan collateral in process of foreclosure, net |  | (14,871,000) |  | (14,512,000) |  |  |
Amortization of origination costs |  | (7,809,000) |  | (6,428,000) |  |  |
Amortization of loan premium |  | (191,000) |  | (247,000) |  |  |
FASB origination costs, net |  | 9,786,000 |  | 10,370,000 |  |  |
Gross loans, ending balance |  | 792,686,000 |  | 713,332,000 |  | 587,038,000 |
Bank Holding Company Accounting [Member] | Home Improvement [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance |  | 247,324,000 |  | 183,155,000 |  |  |
Loan originations |  | 193,098,000 |  | 142,112,000 |  |  |
Principal payments, sales, and maturities |  | (105,813,000) |  | (76,157,000) |  |  |
Charge-offs, net |  | (1,229,000) |  | (786,000) |  |  |
Amortization of origination costs |  | 1,910,000 |  | 1,561,000 |  |  |
Amortization of loan premium |  | (320,000) |  | (416,000) |  |  |
FASB origination costs, net |  | (937,000) |  | (2,145,000) |  |  |
Gross loans, ending balance |  | 334,033,000 |  | 247,324,000 |  | 183,155,000 |
Bank Holding Company Accounting [Member] | Commercial [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance |  | 69,767,000 |  | 64,083,000 |  |  |
Loan originations |  | 7,575,000 |  | 18,578,000 |  |  |
Principal payments, sales, and maturities |  | (13,183,000) |  | (13,553,000) |  |  |
Charge-offs, net |  | (28,000) |  | (819,000) |  |  |
Amortization of origination costs |  | 8,000 |  | 34,000 |  |  |
FASB origination costs, net |  |  |  | 610,000 |  |  |
Paid-in-kind interest |  | 1,188,000 |  | 834,000 |  |  |
Gross loans, ending balance |  | 65,327,000 |  | 69,767,000 |  | 64,083,000 |
Bank Holding Company Accounting [Member] | Medallion [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Gross loans, beginning balance |  | 130,432,000 |  | 183,606,000 |  |  |
Principal payments, sales, and maturities |  | (13,207,000) |  | (15,070,000) |  |  |
Charge-offs, net |  | (42,648,000) |  | (18,664,000) |  |  |
Transfer to loan collateral in process of foreclosure, net |  | (32,383,000) |  | (16,836,000) |  |  |
Amortization of origination costs |  | (131,000) |  | (119,000) |  |  |
Amortization of loan premium |  | (2,531,000) |  | (2,626,000) |  |  |
FASB origination costs, net |  | 36,000 |  | 141,000 |  |  |
Loans transferred to other foreclosed property |  | (1,800,000) |  |  |  |  |
Gross loans, ending balance |  | 37,768,000 |  | $ 130,432,000 |  | $ 183,606,000 |
Bank Holding Company Accounting [Member] | Strategic Partnership [Member] |  |  |  |  |  |  |
Schedule Of Gross Real Estate And Loan Activity [Line Items] |  |  |  |  |  |  |
Loan originations |  | 1,663,000 |  |  |  |  |
Principal payments, sales, and maturities |  | (1,639,000) |  |  |  |  |
Gross loans, ending balance |  | $ 24,000 |  |  |  |  |
[1] | Excludes loan premiums of $5,758 resulting from purchase price accounting and $18,403 of capitalized loan origination costs.
[2] | As of December 31, 2020, cumulative charge-offs of loans and loan collateral in process of foreclosure in the medallion loan portfolio were $279,188, some of which represents collection opportunities for the Company.
[3] | Balance includes the nine months ended December 31, 2018 under Bank Holding Company Accounting and the three months ended March 31, 2018 under Investment Company Accounting.
[4] | Excludes loan premiums of $2,717 resulting from purchase price accounting and $21,345 of capitalized loan origination costs.

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