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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Loans        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance $ 1,364 $ 2,987 $ 1,539 $ 2,960
Loans liquidated     (163)  
Principal paydowns (14) (18) (24) (36)
Total unrealized gain (loss) included in net income 20 (13) 18 32
Ending balance 1,370 2,956 1,370 2,956
Interest-only Strips        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance 125 1,534 238 894
Interest-only strip additions       1,820
Interest-only strip write-offs (44) (689) (157) (1,869)
Ending balance $ 81 $ 845 $ 81 $ 845