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Loans, Troubled Debt Restructurings Segregated by Class (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) Loan | Mar. 31, 2016 USD ($) Loan | Dec. 31, 2016 USD ($) Loan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 4 | 25 | 43
Post-Modification Outstanding Balance | $ 425 | $ 10,211 | $ 16,152
Commitment to extend additional credit on loans modified in TDRs | $ 100 |  |
Defaulted restructured loans, number of loans | Loan | 0 | 2 |
Defaulted restructured loans, recorded balance | $ 0 | $ 868 |
Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 425 | 9,887 | 15,203
Rate Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0
Combination [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | $ 0 | $ 324 | $ 949
Commercial [Member] | Construction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan |  | 1 | 1
Post-Modification Outstanding Balance |  | $ 1,288 | $ 1,288
Commercial [Member] | Construction [Member] | Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance |  | 1,288 | 1,288
Commercial [Member] | Construction [Member] | Rate Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance |  | 0 | 0
Commercial [Member] | Construction [Member] | Combination [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance |  | $ 0 | $ 0
Commercial [Member] | Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 1 | 13 | 27
Post-Modification Outstanding Balance | $ 49 | $ 4,042 | $ 9,408
Defaulted restructured loans, number of loans | Loan | 0 | 1 |
Defaulted restructured loans, recorded balance | $ 0 | $ 510 |
Commercial [Member] | Real Estate [Member] | Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 49 | 3,998 | 8,827
Commercial [Member] | Real Estate [Member] | Rate Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0
Commercial [Member] | Real Estate [Member] | Combination [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | $ 0 | $ 44 | $ 581
Commercial [Member] | Other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 2 | 10 | 14
Post-Modification Outstanding Balance | $ 53 | $ 4,601 | $ 5,175
Defaulted restructured loans, number of loans | Loan | 0 | 1 |
Defaulted restructured loans, recorded balance | $ 0 | $ 358 |
Commercial [Member] | Other [Member] | Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 53 | 4,601 | 5,088
Commercial [Member] | Other [Member] | Rate Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 0 | 0 | 0
Commercial [Member] | Other [Member] | Combination [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | $ 0 | $ 0 | $ 87
Residential [Member] | Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 1 | 1 | 1
Post-Modification Outstanding Balance | $ 323 | $ 280 | $ 281
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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