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Borrowings - Long-term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Long-term borrowings |  |
Early debt repayment charges |  | $ (2,197)
2028 Subordinated Notes | Subordinated Notes |  |
Long-term borrowings |  |
Aggregate principal amount | $ 4,000 |
Fixed rate (as a percent) | 6.99% |
2030 Subordinated Notes | Subordinated Notes |  |
Long-term borrowings |  |
Aggregate principal amount | $ 20,000 |
2030 Subordinated Notes | Subordinated Notes | Until September 2025 |  |
Long-term borrowings |  |
Fixed rate (as a percent) | 4.875% |
2030 Subordinated Notes | Subordinated Notes | Thereafter | Three month SOFR |  |
Long-term borrowings |  |
Variable rate, basis spread (as a percent) | 4.755% |
Non-recourse revolving bank line of credit | Subordinated Notes |  |
Long-term borrowings |  |
Revolving bank line of credit terminated | $ 50,000 |
Repayment of revolving bank line of credit |  | 75,030
Repayment of FHLB advances |  | 44,500
Early debt repayment charges |  | $ 2,200

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