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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Loans        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance $ 1,352 $ 1,364 $ 1,359 $ 1,539
Loans liquidated       163
Principal paydowns (7) (14) (24) (24)
Total unrealized gain (loss) included in net income 6 20 16 18
Ending balance $ 1,351 1,370 $ 1,351 1,370
Interest-only Strips        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance   125   238
Interest-only strip write-offs   (44)   (157)
Ending balance   $ 81   $ 81