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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Financial Instruments with Off-Balance Sheet Risk    
Cash on deposit in correspondent banks exceeding the federally insured limits $ 10,800 $ 5,100
Commitments to grant loans | Contract credit risk    
Financial Instruments with Off-Balance Sheet Risk    
Financial instruments outstanding 29,948 22,349
Unused commitments to fund loans and lines of credit | Contract credit risk    
Financial Instruments with Off-Balance Sheet Risk    
Financial instruments outstanding 258,134 216,043
Commercial and standby letters of credit | Contract credit risk    
Financial Instruments with Off-Balance Sheet Risk    
Financial instruments outstanding $ 10,772 $ 9,383
Letters of credit expiration period (in years) 1 year