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Loans and Allowance for Loan Losses - Interest Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Impaired      
Loans with related allowance for loan losses, Average recorded investment $ 4,784 $ 6,750 $ 4,753
Loans with no related allowance for loan losses, Average recorded investment 6,460 3,217 3,072
Loans, Average recorded investment 11,244 9,967 7,825
Loans with related allowance for loan losses, Interest income 152 16  
Loans with no related allowance for loan losses, Interest income 28 42 50
Loans, Interest income 180 58 50
Commercial | Commercial and industrial      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 765 839 3,163
Loans with no related allowance for loan losses, Average recorded investment 4,151 2,434 1,595
Loans, Average recorded investment 4,916 3,273 4,758
Loans with related allowance for loan losses, Interest income 14 16  
Loans with no related allowance for loan losses, Interest income 25 30 35
Loans, Interest income 39 46 35
Commercial | Commercial real estate      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 3,972 5,891 1,558
Loans with no related allowance for loan losses, Average recorded investment 1,614 212 223
Loans, Average recorded investment 5,586 6,103 1,781
Loans with related allowance for loan losses, Interest income 138    
Loans with no related allowance for loan losses, Interest income   8 9
Loans, Interest income 138 8 9
Consumer | Residential | Real estate first mortgage      
Impaired      
Loans with no related allowance for loan losses, Average recorded investment 461 230 533
Loans, Average recorded investment 461 230 533
Consumer | Residential | Real estate junior lien      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 19   4
Loans with no related allowance for loan losses, Average recorded investment 234 338 718
Loans, Average recorded investment 253 338 722
Loans with no related allowance for loan losses, Interest income 3 4 6
Loans, Interest income 3 4 6
Consumer | Other revolving and installment      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 28 20 28
Loans with no related allowance for loan losses, Average recorded investment   3 3
Loans, Average recorded investment $ 28 $ 23 $ 31