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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, 2017 USD ($) Loan | Sep. 30, 2016 USD ($) Loan | Sep. 30, 2017 USD ($) Loan | Sep. 30, 2016 USD ($) Loan | Dec. 31, 2016 USD ($) Loan
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | Loan | 7 | 2 | 25 | 45 | 43
Post-Modification Outstanding Balance | $ 397 | $ 152 | $ 2,722 | $ 13,070 | $ 16,152
Commitment to extend additional credit on loans modified in TDRs | $ 100 |  | $ 100 |  |
Defaulted restructured loans, number of loans | Loan | 3 | 2 | 3 | 4 |
Defaulted restructured loans, recorded balance | $ 1,807 | $ 1,460 | $ 1,807 | $ 2,328 |
Term Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | 397 | 152 | 2,280 | 12,210 | 15,203
Rate Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0 | 0 | 0
Combination [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | $ 0 | $ 0 | $ 442 | $ 860 | $ 949
Commercial [Member] | Construction [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  | 2 | 5 | 1
Post-Modification Outstanding Balance |  |  | $ 114 | $ 1,408 | $ 1,288
Commercial [Member] | Construction [Member] | Term Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | 0 | 1,408 | 1,288
Commercial [Member] | Construction [Member] | Rate Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | 0 | 0 | 0
Commercial [Member] | Construction [Member] | Combination [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | $ 114 | $ 0 | $ 0
Commercial [Member] | Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | Loan | 6 | 2 | 11 | 23 | 27
Post-Modification Outstanding Balance | $ 295 | $ 152 | $ 1,066 | $ 6,341 | $ 9,408
Defaulted restructured loans, number of loans | Loan | 2 | 1 | 2 | 2 |
Defaulted restructured loans, recorded balance | $ 961 | $ 1,446 | $ 961 | $ 1,956 |
Commercial [Member] | Real Estate [Member] | Term Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | 295 | 152 | 874 | 5,761 | 8,827
Commercial [Member] | Real Estate [Member] | Rate Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0 | 0 | 0
Commercial [Member] | Real Estate [Member] | Combination [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | $ 0 | $ 0 | $ 192 | $ 580 | $ 581
Commercial [Member] | Other [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | Loan | 1 |  | 10 | 16 | 14
Post-Modification Outstanding Balance | $ 102 |  | $ 373 | $ 5,041 | $ 5,175
Defaulted restructured loans, number of loans | Loan |  | 1 |  | 2 |
Defaulted restructured loans, recorded balance |  | $ 14 |  | $ 372 |
Commercial [Member] | Other [Member] | Term Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | 102 |  | 237 | 5,041 | 5,088
Commercial [Member] | Other [Member] | Rate Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | 0 |  | 0 | 0 | 0
Commercial [Member] | Other [Member] | Combination [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance | $ 0 |  | $ 136 | $ 0 | $ 87
Residential [Member] | Construction [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  | 1 |  |
Post-Modification Outstanding Balance |  |  | $ 846 |  |
Defaulted restructured loans, number of loans | Loan |  |  | 1 |  |
Defaulted restructured loans, recorded balance |  |  | $ 846 |  |
Residential [Member] | Construction [Member] | Term Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | 846 |  |
Residential [Member] | Construction [Member] | Rate Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | 0 |  |
Residential [Member] | Construction [Member] | Combination [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | $ 0 |  |
Residential [Member] | Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  | 1 | 1 | 1
Post-Modification Outstanding Balance |  |  | $ 323 | $ 280 | $ 281
Defaulted restructured loans, number of loans | Loan | 1 |  |  |  |
Defaulted restructured loans, recorded balance | $ 846 |  |  |  |
Residential [Member] | Real Estate [Member] | Term Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | 323 | 0 | 0
Residential [Member] | Real Estate [Member] | Rate Modification [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | 0 | 0 | 0
Residential [Member] | Real Estate [Member] | Combination [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-Modification Outstanding Balance |  |  | $ 0 | $ 280 | $ 281

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