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Loans, Troubled Debt Restructurings Segregated by Class (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Loan | Sep. 30, 2017 USD ($) Loan | Sep. 30, 2018 USD ($) Loan | Sep. 30, 2017 USD ($) Loan | Dec. 31, 2017 USD ($) Loan
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Number of Loans | Loan | 7 | 7 | 36 | 25 | 43
Post-Modification Outstanding Balance | $ 2,692 | $ 397 | $ 7,157 | $ 2,722 | $ 5,547
Commitment to extend additional credit on loans modified in TDRs | $ 42 |  | $ 42 |  |
Defaulted restructured loans, number of loans | Loan | 3 | 3 | 5 | 3 |
Defaulted restructured loans, recorded balance | $ 153 | $ 1,807 | $ 195 | $ 1,807 |
Term Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | 2,292 | 397 | 5,759 | 2,280 | 5,105
Rate Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0 | 0 | 0
Combination [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | $ 400 | $ 0 | $ 1,398 | $ 442 | $ 442
Commercial [Member] | Construction [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Number of Loans | Loan |  |  | 4 | 2 | 2
Post-Modification Outstanding Balance |  |  | $ 458 | $ 114 | $ 114
Defaulted restructured loans, number of loans | Loan | 2 | 0 | 2 | 0 |
Defaulted restructured loans, recorded balance | $ 147 | $ 0 | $ 147 | $ 0 |
Commercial [Member] | Construction [Member] | Term Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | 443 | 0 | 0
Commercial [Member] | Construction [Member] | Rate Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | 0 | 0 | 0
Commercial [Member] | Construction [Member] | Combination [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | $ 15 | $ 114 | $ 114
Commercial [Member] | Real Estate [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Number of Loans | Loan | 6 | 6 | 23 | 11 | 15
Post-Modification Outstanding Balance | $ 2,428 | $ 295 | $ 5,970 | $ 1,066 | $ 2,391
Defaulted restructured loans, number of loans | Loan | 0 | 2 | 1 | 2 |
Defaulted restructured loans, recorded balance | $ 0 | $ 961 | $ 17 | $ 961 |
Commercial [Member] | Real Estate [Member] | Term Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | 2,028 | 295 | 4,587 | 874 | 2,199
Commercial [Member] | Real Estate [Member] | Rate Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0 | 0 | 0
Commercial [Member] | Real Estate [Member] | Combination [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | $ 400 | $ 0 | $ 1,383 | $ 192 | $ 192
Commercial [Member] | Other [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Number of Loans | Loan |  | 1 | 8 | 10 | 22
Post-Modification Outstanding Balance |  | $ 102 | $ 465 | $ 373 | $ 1,208
Defaulted restructured loans, number of loans | Loan | 1 | 0 | 2 | 0 |
Defaulted restructured loans, recorded balance | $ 6 | $ 0 | $ 31 | $ 0 |
Commercial [Member] | Other [Member] | Term Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  | 102 | 465 | 237 | 1,072
Commercial [Member] | Other [Member] | Rate Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  | 0 | 0 | 0 | 0
Commercial [Member] | Other [Member] | Combination [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  | $ 0 | $ 0 | $ 136 | $ 136
Residential [Member] | Construction [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Number of Loans | Loan |  |  |  | 1 | 1
Post-Modification Outstanding Balance |  |  |  | $ 846 | $ 846
Residential [Member] | Construction [Member] | Term Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  |  |  | 846 | 846
Residential [Member] | Construction [Member] | Rate Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  |  |  | 0 | 0
Residential [Member] | Construction [Member] | Combination [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance |  |  |  | $ 0 | $ 0
Residential [Member] | Real Estate [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Number of Loans | Loan | 1 |  | 1 | 1 | 3
Post-Modification Outstanding Balance | $ 264 |  | $ 264 | $ 323 | $ 988
Defaulted restructured loans, number of loans | Loan | 0 | 1 | 0 | 1 |
Defaulted restructured loans, recorded balance | $ 0 | $ 846 | $ 0 | $ 846 |
Residential [Member] | Real Estate [Member] | Term Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | 264 |  | 264 | 323 | 988
Residential [Member] | Real Estate [Member] | Rate Modification [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | 0 |  | 0 | 0 | 0
Residential [Member] | Real Estate [Member] | Combination [Member] |  |  |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |  |  |
Post-Modification Outstanding Balance | $ 0 |  | $ 0 | $ 0 | $ 0

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