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Loans and Allowance for Loan Losses - Summary of Inclusive Capitalized Loans (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 1,205,776,000 | [1] | $ 1,136,694,000 | [2] |  |
Allowance for loan losses |  | (57,548,000) | [3],[4] | (46,093,000) | [3],[4] | $ (36,395,000) | $ (46,093,000)
Net loans receivable |  | 1,172,290,000 |  | 1,114,762,000 |  | 981,487,000 |
Bank Holding Company Accounting [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | 1,229,838,000 |  | 1,160,855,000 |  | 1,017,882,000 |
Allowance for loan losses |  | (57,548,000) |  | (46,093,000) |  |  |
Net loans receivable |  | $ 1,172,290,000 |  | $ 1,114,762,000 |  |  |
Percentage of total gross loans |  | 100.00% |  | 100.00% |  |  |
Recreation [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 767,374,000 | [1] | $ 689,810,000 | [2] |  |
Allowance for loan losses |  | (27,348,000) |  | (18,075,000) |  |  |
Recreation [Member] | Bank Holding Company Accounting [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 792,686,000 |  | $ 713,332,000 |  | 587,038,000 |
Percentage of total gross loans |  | 65.00% |  | 62.00% |  |  |
Home Improvement [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 336,885,000 | [1] | $ 250,830,000 | [2] |  |
Allowance for loan losses |  | (5,157,000) |  | (2,608,000) |  |  |
Home Improvement [Member] | Bank Holding Company Accounting [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 334,033,000 |  | $ 247,324,000 |  | 183,155,000 |
Percentage of total gross loans |  | 27.00% |  | 21.00% |  |  |
Commercial [Member] | Bank Holding Company Accounting [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 65,327,000 |  | $ 69,767,000 |  | 64,083,000 |
Percentage of total gross loans |  | 5.00% |  | 6.00% |  |  |
Medallion [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 36,153,000 | [1] | $ 126,287,000 | [2] |  |
Allowance for loan losses |  | (25,043,000) |  | (25,410,000) |  |  |
Medallion [Member] | Bank Holding Company Accounting [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 37,768,000 |  | $ 130,432,000 |  | $ 183,606,000 |
Percentage of total gross loans |  | 3.00% |  | 11.00% |  |  |
Strategic Partnership [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans | [1] | $ 24,000 |  |  |  |  |
Allowance for loan losses |  | 0 |  |  |  |  |
Strategic Partnership [Member] | Bank Holding Company Accounting [Member] |  |  |  |  |  |  |
Student Loan Portfolio By Program [Line Items] |  |  |  |  |  |  |
Total gross loans |  | $ 24,000 |  |  |  |  |
[1] | Excludes loan premiums of $2,717 resulting from purchase price accounting and $21,345 of capitalized loan origination costs.
[2] | Excludes loan premiums of $5,758 resulting from purchase price accounting and $18,403 of capitalized loan origination costs.
[3] | As of December 31, 2020, the general reserves previously recorded for the Company’s medallion loan portfolio had been reversed as all loans had been deemed impaired and written down to collateral value.
[4] | As of December 31, 2020, there was no allowance for loan losses and net charge-offs related to the strategic partnership loans.

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