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Funds Borrowed - Additional Information (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2021
USD ($)
Jul. 31, 2020
USD ($)
Dec. 31, 2007
USD ($)
Jun. 30, 2007
USD ($)
shares
Apr. 30, 2016
USD ($)
Mar. 31, 2022
USD ($)
Deposit
shares
Mar. 31, 2021
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
shares
Apr. 30, 2021
USD ($)
Mar. 15, 2021
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
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.           $ 8,700,000     $ 8,700,000            
Maturity date           2021                  
Maturity date Feb. 28, 2026 Sep. 24, 2024                          
Debt instrument face amount   $ 25,000,000.0                          
Remaining amount of debenture after deducting leverage fee kept for capitalization of retained earning or capital infusion           $ 4,800,000                  
Issue of common stock | shares           28,526,016     28,124,629            
Preferred securities repurchased from a third party investor     $ 2,000,000.0                        
Long-term debt [1]           $ 220,006,000     $ 219,973,000            
Gain on debt extinguishment           0 $ (1,767,000)                
Debenture Mature 2021 [Member]                              
Debt Instrument [Line Items]                              
Debt instrument commitments drawn           15,500,000                  
Long-term debt           $ 8,500,000                  
Preferred Securities [Member]                              
Debt Instrument [Line Items]                              
Maturity date           Sep. 30, 2037                  
Sale of preferred securities       $ 35,000,000.0                      
Issue of common stock | shares       1,083                      
Preferred securities outstanding           $ 33,000,000.0                  
Preferred Securities [Member] | 90 day LIBOR [Member]                              
Debt Instrument [Line Items]                              
Basis spread on variable rate           (0.96%)                  
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       $ 36,100,000                      
Small Business Administration Debentures and Borrowings [Member]                              
Debt Instrument [Line Items]                              
Debt instrument interest rate Percentage           3.25%                  
Loan commitment term           4 years 6 months                  
Commitment fee percentage   1.00%       1.00%                  
Principal amount of loan                             $ 34,000,000.0
Extended maturity date           Apr. 30, 2024                  
Debt instrument commitments available           $ 9,500,000                  
Debt instrument outstanding amount           69,800,000                  
Debt instrument remaining amount           $ 8,800,000                  
Remaining amount of debenture after deducting leverage fee kept for capitalization of retained earning or capital infusion   $ 9,500,000                          
FSVC's [Member]                              
Debt Instrument [Line Items]                              
Principal amount of loan                             $ 33,500,000
7.25% Unsecured Senior Notes Due February 2026 [Member]                              
Debt Instrument [Line Items]                              
Aggregate principal amount                   $ 3,000,000.0 $ 3,300,000        
7.50% Unsecured Senior Notes Due December 2027 [Member]                              
Debt Instrument [Line Items]                              
Aggregate principal amount                   $ 11,700,000          
Privately Placed Notes [Member]                              
Debt Instrument [Line Items]                              
Aggregate principal amount $ 25,000,000.0       $ 33,600,000           $ 8,500,000 $ 33,600,000 $ 6,000,000.0 $ 30,000,000.0  
Debt instrument interest rate Percentage 7.25%       9.00%             7.50%   8.25%  
Maturity date           2024                  
Maturity date           Dec. 31, 2027                  
Gain loss on sales of loans net               $ 4,100,000              
Net proceeds from offering         $ 31,800,000                    
Maximum [Member]                              
Debt Instrument [Line Items]                              
Time deposits           $ 100,000                  
Minimum [Member]                              
Debt Instrument [Line Items]                              
Time deposits           $ 250,000                  
Brokerage [Member] | Maximum [Member]                              
Debt Instrument [Line Items]                              
Average brokerage fee percentage in relation to the maturity of deposits           0.15%                  
[1] Includes $3.8 million and $4.0 million of deferred financing costs as of March 31, 2022 and December 31, 2021. Refer to Note 5 for more details.