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Other Real Estate Owned - Other Real Estate Owned Rollforward (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Banking And Thrift Other Disclosures [Abstract]      
Balance, beginning $ 607 $ 183 $ 183
Transfer from loans 266 310 441
Gain on foreclosures   132 166
Sales (588) (183) (183)
Valuation adjustments (92)    
Balance, ending $ 193 $ 442 $ 607