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Loans and Allowance for Loan Losses - Interest Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Impaired      
Loans with related allowance for loan losses, Average recorded investment $ 704 $ 4,784 $ 6,750
Loans with no related allowance for loan losses, Average recorded investment 2,782 6,460 3,217
Loans, Average recorded investment 3,486 11,244 9,967
Loans with related allowance for loan losses, Interest income 20 152 16
Loans with no related allowance for loan losses, Interest income 20 28 42
Loans, Interest income 40 180 58
Commercial | Commercial and industrial      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 517 765 839
Loans with no related allowance for loan losses, Average recorded investment 1,988 4,151 2,434
Loans, Average recorded investment 2,505 4,916 3,273
Loans with related allowance for loan losses, Interest income 13 14 16
Loans with no related allowance for loan losses, Interest income 20 25 30
Loans, Interest income 33 39 46
Commercial | Commercial real estate      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 187 3,972 5,891
Loans with no related allowance for loan losses, Average recorded investment 672 1,614 212
Loans, Average recorded investment 859 5,586 6,103
Loans with related allowance for loan losses, Interest income 7 138  
Loans with no related allowance for loan losses, Interest income     8
Loans, Interest income 7 138 8
Consumer | Residential | Real estate first mortgage      
Impaired      
Loans with no related allowance for loan losses, Average recorded investment 23 461 230
Loans, Average recorded investment 23 461 230
Consumer | Residential | Real estate junior lien      
Impaired      
Loans with related allowance for loan losses, Average recorded investment   19  
Loans with no related allowance for loan losses, Average recorded investment 98 234 338
Loans, Average recorded investment 98 253 338
Loans with no related allowance for loan losses, Interest income   3 4
Loans, Interest income   3 4
Consumer | Other revolving and installment      
Impaired      
Loans with related allowance for loan losses, Average recorded investment   28 20
Loans with no related allowance for loan losses, Average recorded investment 1   3
Loans, Average recorded investment $ 1 $ 28 $ 23