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Loans and Allowance for Loan Losses (Details) - Summary loan commitments, unused lines of credit and standby letters of credit - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loans and Allowance for Loan Losses (Details) - Summary loan commitments, unused lines of credit and standby letters of credit [Line Items]    
Letters of credit outstanding, Amount $ 190,512 $ 170,876
Unused lines of Credit [Member]    
Loans and Allowance for Loan Losses (Details) - Summary loan commitments, unused lines of credit and standby letters of credit [Line Items]    
Letters of credit outstanding, Amount 187,855 168,731
Standby Letters of Credit [Member]    
Loans and Allowance for Loan Losses (Details) - Summary loan commitments, unused lines of credit and standby letters of credit [Line Items]    
Letters of credit outstanding, Amount $ 2,657 $ 2,145