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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Fair Value Disclosures [Abstract]      
Loans individually evaluated for allowance $ 19,100 $ 19,300  
Allowance for loan losses $ 1,776 $ 2,668 $ 2,383