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Fair Value Measurements - Rollforward of Loans and Interest Only Strips Measured at Estimated Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Loans        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance $ 1,370 $ 2,956 $ 1,539 $ 2,960
Loans liquidated     (163)  
Principal paydowns (10) (9) (34) (44)
Total unrealized gain (loss) included in net income   380 18 411
Ending balance 1,360 3,327 1,360 3,327
Interest-only Strips        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance 81 845 238 894
Interest-only strip additions       1,820
Interest-only strip write-offs (65) (365) (222) (2,234)
Total unrealized gain (loss) included in net income   (7)   (7)
Ending balance $ 16 $ 473 $ 16 $ 473