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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Loans        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance $ 2,987 $ 2,971 $ 2,960 $ 3,463
Loans liquidated   45   (421)
Principal paydowns (18) (17) (36) (34)
Total unrealized gain (loss) included in net income (13) (25) 32 (34)
Ending balance 2,956 2,974 2,956 2,974
Interest-only Strips        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance 1,534 1,609 894 812
Interest-only strip additions   330 1,820 1,634
Interest-only strip write-offs (689) (661) (1,869) (1,131)
Total unrealized gain (loss) included in net income   (85)   (122)
Ending balance $ 845 $ 1,193 $ 845 $ 1,193