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Loans, Troubled Debt Restructurings Segregated by Class (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) Loan | Mar. 31, 2018 USD ($) Loan | Dec. 31, 2018 USD ($) Loan
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Number of Loans | Loan | 13 | 16 | 40
Post-Modification Outstanding Balance | $ 3,195 | $ 1,998 | $ 9,017
Commitment to extend additional credit on loans modified in TDRs | $ 45 |  |
Defaulted restructured loans, number of loans | Loan | 0 | 0 |
Term Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | $ 2,413 | $ 1,000 | 6,915
Rate Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0
Combination [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | $ 782 | $ 998 | $ 2,102
Commercial [Member] | Construction [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Number of Loans | Loan |  | 2 | 5
Post-Modification Outstanding Balance |  | $ 47 | $ 2,197
Commercial [Member] | Construction [Member] | Term Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance |  | 32 | 2,182
Commercial [Member] | Construction [Member] | Rate Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance |  | 0 | 0
Commercial [Member] | Construction [Member] | Combination [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance |  | $ 15 | $ 15
Commercial [Member] | Real Estate [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Number of Loans | Loan | 5 | 9 | 24
Post-Modification Outstanding Balance | $ 1,470 | $ 1,769 | $ 5,387
Commercial [Member] | Real Estate [Member] | Term Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | 828 | 786 | 4,004
Commercial [Member] | Real Estate [Member] | Rate Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0
Commercial [Member] | Real Estate [Member] | Combination [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | $ 642 | $ 983 | $ 1,383
Commercial [Member] | Other [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Number of Loans | Loan | 7 | 5 | 8
Post-Modification Outstanding Balance | $ 1,262 | $ 182 | $ 465
Commercial [Member] | Other [Member] | Term Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | 1,122 | 182 | 465
Commercial [Member] | Other [Member] | Rate Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0
Commercial [Member] | Other [Member] | Combination [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | $ 140 | $ 0 | $ 0
Residential [Member] | Construction [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Number of Loans | Loan |  |  | 0
Post-Modification Outstanding Balance |  |  | $ 0
Residential [Member] | Construction [Member] | Term Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance |  |  | 0
Residential [Member] | Construction [Member] | Rate Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance |  |  | 0
Residential [Member] | Construction [Member] | Combination [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance |  |  | $ 0
Residential [Member] | Real Estate [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Number of Loans | Loan | 1 |  | 3
Post-Modification Outstanding Balance | $ 463 |  | $ 968
Residential [Member] | Real Estate [Member] | Term Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | 463 |  | 264
Residential [Member] | Real Estate [Member] | Rate Modification [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | 0 |  | 0
Residential [Member] | Real Estate [Member] | Combination [Member] |  |  |
Troubled Debt Restructurings Segregated by Class [Abstract] |  |  |
Post-Modification Outstanding Balance | $ 0 |  | $ 704

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