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Loans and Allowance for Credit Losses - Credit impaired loans acquired during the period (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required payments receivable on PCI loans at acquisition: $ 11,371,000 $ 4,305,000
Cash flows expected to be collected at acquisition 10,072,000 1,504,000
Purchased credit impaired loans 11,186,000 3,734,000
Related Allowance 631,000 40,000
Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Related Allowance $ 0 $ 0