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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financial Instruments with Off-Balance Sheet Risk    
Cash on deposit in correspondent banks exceeding the federally insured limits $ 26,300 $ 25,300
Commitments to grant loans | Contract credit risk    
Financial Instruments with Off-Balance Sheet Risk    
Financial instruments outstanding 9,286 13,598
Unused commitments to fund loans and lines of credit | Contract credit risk    
Financial Instruments with Off-Balance Sheet Risk    
Financial instruments outstanding 151,122 166,259
Commercial and standby letters of credit | Contract credit risk    
Financial Instruments with Off-Balance Sheet Risk    
Financial instruments outstanding $ 9,475 $ 5,529
Letters of credit expiration period (in years) 1 year