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.