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Loans and Allowance for Loan Losses - Interest Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Impaired      
Loans with related allowance for loan losses, Average recorded investment $ 6,750 $ 4,753 $ 3,235
Loans with no related allowance for loan losses, Average recorded investment 3,217 3,072 4,334
Loans, Average recorded investment 9,967 7,825 7,569
Loans with related allowance for loan losses, Interest income 16   181
Loans with no related allowance for loan losses, Interest income 42 50 252
Loans, Interest income 58 50 433
Commercial | Commercial and industrial      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 839 3,163 2,605
Loans with no related allowance for loan losses, Average recorded investment 2,434 1,595 1,676
Loans, Average recorded investment 3,273 4,758 4,281
Loans with related allowance for loan losses, Interest income 16   148
Loans with no related allowance for loan losses, Interest income 30 35 89
Loans, Interest income 46 35 237
Commercial | Real estate construction      
Impaired      
Loans with no related allowance for loan losses, Average recorded investment     65
Loans, Average recorded investment     65
Loans with no related allowance for loan losses, Interest income     3
Loans, Interest income     3
Commercial | Commercial real estate      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 5,891 1,558 234
Loans with no related allowance for loan losses, Average recorded investment 212 223  
Loans, Average recorded investment 6,103 1,781 234
Loans with related allowance for loan losses, Interest income     9
Loans with no related allowance for loan losses, Interest income 8 9  
Loans, Interest income 8 9 9
Consumer | Residential | Real estate first mortgage      
Impaired      
Loans with no related allowance for loan losses, Average recorded investment 230 533 620
Loans, Average recorded investment 230 533 620
Loans with no related allowance for loan losses, Interest income     37
Loans, Interest income     37
Consumer | Residential | Real estate junior lien      
Impaired      
Loans with related allowance for loan losses, Average recorded investment   4 317
Loans with no related allowance for loan losses, Average recorded investment 338 718 1,963
Loans, Average recorded investment 338 722 2,280
Loans with related allowance for loan losses, Interest income     18
Loans with no related allowance for loan losses, Interest income 4 6 123
Loans, Interest income 4 6 141
Consumer | Other revolving and installment      
Impaired      
Loans with related allowance for loan losses, Average recorded investment 20 28 79
Loans with no related allowance for loan losses, Average recorded investment 3 3 10
Loans, Average recorded investment $ 23 $ 31 89
Loans with related allowance for loan losses, Interest income     6
Loans, Interest income     $ 6