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Borrowings - Long-term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Long-term borrowings
Early debt repayment charges	$ (2,197)
Long-term borrowings	30,398	$ 119,529
Non-recourse revolving bank line of credit
Long-term borrowings
Long-term borrowings	0	$ 75,030
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
Maximum borrowing capacity	$ 50,000
Commitment fees percentage	0.75%
Repayment of revolving bank line of credit	$ 75,030
Repayment of FHLB advances	44,500
Early debt repayment charges	$ 2,200
Non-recourse revolving bank line of credit | Subordinated Notes | London Interbank Offered Rate (LIBOR)
Long-term borrowings
Variable rate, floor spread (as a percent)	30.00%
Variable rate, basis spread (as a percent)	2.00%

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Contractual interest rate for funds borrowed, under the debt agreement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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