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Funds Borrowed - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 06, 2019 USD ($) | Dec. 31, 2007 USD ($) | Jun. 30, 2007 USD ($) shares | Dec. 31, 2020 USD ($) shares | Jul. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Nov. 30, 2018 USD ($) | Apr. 30, 2016 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Deposit shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Mar. 15, 2021 USD ($) | Feb. 28, 2021 USD ($) | Aug. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individual with time deposits greater than $100,000 | Deposit |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Listing services deposits from other financial institutions. |  |  |  |  | $ 995,000 |  |  |  |  |  | $ 995,000 |  |  |  |  |  |
Debt instrument outstanding amount |  |  |  |  |  | $ 8,500,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument remaining amount |  |  |  |  |  | 16,500,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |
Debentures term |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Leverage fee amount |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |
Remaining portion of leverage fee amount |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Debentures borrowed | [1] |  |  |  | 153,718,000 |  |  |  |  |  | 153,718,000 | $ 174,614,000 |  |  |  |  |
Remaining amount of debenture after deducting leverage fee kept for capitalization of retained earning or capital infusion |  |  |  |  |  | $ 8,250,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument commitments drawn |  |  |  |  | $ 0 |  |  |  |  |  | $ 0 |  |  |  |  |  |
Repayments of credit facilities |  | $ 10,819,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waiver of loan from lender |  | $ 1,839,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waiver Expiry Date |  | Jun. 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pay off one of the notes payable discount rate |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Gain on debt extinguishment |  |  |  |  |  |  |  |  |  | $ 4,145,000 |  | $ 4,145,000 |  |  |  |  |
Gain loss on sales of loans net | [2] |  |  |  |  |  |  |  |  |  |  |  | $ 4,946,000 |  |  |  |
Issue of common stock | shares |  |  |  |  | 27,828,871 |  |  |  |  |  | 27,828,871 | 27,597,802 |  |  |  |  |
Short term promissory note |  |  |  |  | $ 87,334,000 |  |  |  |  |  | $ 87,334,000 | $ 38,223,000 |  |  |  |  |
Maturity term |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
CARES Act [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debentures term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Loan amount |  |  |  |  | 747,000 |  |  |  |  |  | $ 747,000 |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Maturity term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Richard Petty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2022 |  |  |  |  |  |
Loan amount |  |  |  |  | 7,442,000 |  |  |  |  |  | $ 7,442,000 |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Travis Burt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2021 |  |  |  |  |  |
Short term promissory note |  |  |  |  | $ 500,000 |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
Retail and Privately Placed Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate Percentage |  |  |  |  | 7.50% |  | 8.25% |  | 9.00% | 8.25% | 7.50% |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 33,600,000 |  | $ 30,000,000 |  | $ 33,625,000 | $ 30,000,000 | $ 33,600,000 |  |  |  |  | $ 6,000,000 |
Maturity date |  |  |  |  |  |  | 2024 |  | 2021 |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |  |  |
Gain loss on sales of loans net |  |  |  |  |  |  |  |  |  | $ 4,145,000 |  |  |  |  |  |  |
Net proceeds from offering |  |  |  |  |  |  |  |  | $ 31,786,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Retail and Privately Placed Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.25% |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |
Subsequent Event [Member] | Retail and Privately Placed Notes [Member] | 7.25% Unsecured Senior Notes Due February 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,250,000 |  |  |
Subsequent Event [Member] | Retail and Privately Placed Notes [Member] | 7.50% Unsecured Senior Notes Due December 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,500,000 |  |  |
Dz Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate Percentage |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |  |  |  |  |  |
Debt instrument expiration date |  |  |  |  |  |  |  | 2023-12 |  |  |  |  |  |  |  |  |
Debenture Mature2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debentures borrowed |  |  |  |  |  | $ 8,500,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2037 |  |  |  |  |  |
Sale of preferred securities |  |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of common stock | shares |  |  |  | 1,083 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred securities outstanding |  |  |  |  | $ 33,000,000 |  |  |  |  |  | $ 33,000,000 |  |  |  |  |  |
Preferred Securities [Member] | 90 day LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 0.24% |  |  |  |  |  |
Preferred Securities [Member] | LIBOR Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 2.13% |  |  |  |  |  |
Preferred Securities [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of unsecured junior subordinated notes |  |  |  | $ 36,083,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Securities [Member] | Third Party Investors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred securities repurchased from a third party investor |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Small Business Administration Debentures and Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan commitment term |  |  |  |  |  |  |  |  |  |  | 4 years 6 months |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Principal amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,024,756
Debt instrument interest rate Percentage |  |  |  |  | 3.25% |  |  |  |  |  | 3.25% |  |  |  |  |  |
Extended maturity date |  |  |  |  |  |  |  |  |  |  | Apr. 15, 2021 |  |  |  |  |  |
Debt instrument commitments amount fully utilized |  |  |  |  | $ 175,485,000 |  |  |  |  |  | $ 175,485,000 |  |  |  |  |  |
Debt instrument commitments available |  |  |  |  | 25,000,000 |  |  |  |  |  | 25,000,000 |  |  |  |  |  |
Debt instrument outstanding amount |  |  |  |  | 68,008,000 |  |  |  |  |  | 68,008,000 |  |  |  |  |  |
Debt instrument remaining amount |  |  |  |  | 14,008,000 |  |  |  |  |  | 14,008,000 |  |  |  |  |  |
FSVC's [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,485,000
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debenture last issuance date |  |  |  |  |  | Sep. 24, 2024 |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  |  |  |  | $ 250,000 |  |  |  |  |  | 250,000 |  |  |  |  |  |
Minimum [Member] | Paid on or Before February 1, 2018 [Member] | Small Business Administration Debentures and Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument minimum annual payment |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |
Minimum [Member] | Paid on or Before February 1, 2019 [Member] | Small Business Administration Debentures and Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument minimum annual payment |  |  |  |  |  |  |  |  |  |  | $ 7,600,000 |  |  |  |  |  |
Brokerage [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average brokerage fee percentage in relation to the maturity of deposits |  |  |  |  |  |  |  |  |  |  | 0.15% |  |  |  |  |  |
[1] | Includes $3,131 and $2,511 of deferred financing costs as of December 31, 2020 and 2019. Refer to Note 6 for more details.
[2] | 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.

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