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Commitments and Contingencies - Commitments to Extend Credit and Letters of Credit (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Commitments to Extend Credit      
Loan Commitments and Letters of Credit [Line Items]      
Notional Amount $ 378,430 $ 349,718 $ 329,337
Fair Value 0 0 0
Standby Letters of Credit      
Loan Commitments and Letters of Credit [Line Items]      
Notional Amount 3,276 3,129 4,396
Fair Value $ 29 $ 31 $ 20
Minimum | Standby Letters of Credit      
Loan Commitments and Letters of Credit [Line Items]      
Loan commitments, fixed fee percent 1.00%    
Maximum | Standby Letters of Credit      
Loan Commitments and Letters of Credit [Line Items]      
Loan commitments, fixed fee percent 3.00%