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Loans and Allowance for Loan Losses - Categories of Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Categories of impaired loans    
Non-accrual loans $ 32,835 $ 34,559
Performing TDRs 1,911 2,776
Total impaired loans $ 34,746 $ 37,335