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Loans and Allowance for Credit Losses - Credit impaired loans acquired during the period (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required payments receivable on PCI loans at acquisition: $ 4,305,000 $ 6,482,000
Cash flows expected to be collected at acquisition 1,504,000 1,392,000
Purchased credit impaired loans 3,734,000 5,909,000
Related Allowance 40,000 90,000
Purchased Credit Impaired Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Related Allowance $ 0 $ 0