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Fair Value of Financial Instruments and Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Investment securities available for sale $ 380,814 $ 347,332
Carrying Amount    
Assets    
Cash and short-term investments 183,506 104,092
Investment securities available for sale 380,814 347,332
Other investments at cost 3,296 4,288
Loans held for sale 52,386 10,076
Loans, net 1,047,376 961,951
Liabilities, Fair Value Disclosure [Abstract]    
Deposits 1,445,027 1,293,742
Federal Home Loan Bank advances 22,500 47,000
Carrying Amount | PPPLF    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 106,789  
Carrying Amount | Other borrowed money    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 37,792 38,792
Estimated Fair Value    
Assets    
Cash and short-term investments 183,506 104,092
Investment securities available for sale 380,814 347,332
Other investments at cost 3,296 4,288
Loans held for sale 52,386 10,076
Loans, net 1,063,785 938,475
Liabilities, Fair Value Disclosure [Abstract]    
Deposits 1,445,984 1,294,506
Federal Home Loan Bank advances 20,817 46,022
Estimated Fair Value | PPPLF    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 106,789  
Estimated Fair Value | Other borrowed money    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 37,792 38,792
Estimated Fair Value | Level 1    
Assets    
Cash and short-term investments 183,506 104,092
Investment securities available for sale 245 0
Other investments at cost 0 0
Loans held for sale 0 0
Loans, net 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Deposits 0 0
Federal Home Loan Bank advances 0 0
Estimated Fair Value | Level 1 | PPPLF    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 0  
Estimated Fair Value | Level 1 | Other borrowed money    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 0 0
Estimated Fair Value | Level 2    
Assets    
Cash and short-term investments 0 0
Investment securities available for sale 380,569 345,310
Other investments at cost 3,296 4,288
Loans held for sale 52,386 10,076
Loans, net 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Deposits 1,445,984 1,294,506
Federal Home Loan Bank advances 20,817 46,022
Estimated Fair Value | Level 2 | PPPLF    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 106,789  
Estimated Fair Value | Level 2 | Other borrowed money    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 37,792 38,792
Estimated Fair Value | Level 3    
Assets    
Cash and short-term investments 0 0
Investment securities available for sale 0 2,022
Other investments at cost 0 0
Loans held for sale 0 0
Loans, net 1,063,785 938,475
Liabilities, Fair Value Disclosure [Abstract]    
Deposits 0 0
Federal Home Loan Bank advances 0 0
Estimated Fair Value | Level 3 | PPPLF    
Liabilities, Fair Value Disclosure [Abstract]    
Debt 0  
Estimated Fair Value | Level 3 | Other borrowed money    
Liabilities, Fair Value Disclosure [Abstract]    
Debt $ 0 $ 0