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Loans, Troubled Debt Restructurings Segregated by Class (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Loan | Mar. 31, 2017 USD ($) Loan | Dec. 31, 2017 USD ($) Loan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 16 | 4 | 43
Post-Modification Outstanding Balance | $ 1,998 | $ 425 | $ 5,547
Commitment to extend additional credit on loans modified in TDRs | 100 |  |
Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 1,000 | 425 | 5,105
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 | $ 998 | $ 0 | $ 442
Commercial [Member] | Construction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 2 |  | 2
Post-Modification Outstanding Balance | $ 47 |  | $ 114
Commercial [Member] | Construction [Member] | Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 32 |  | 0
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 | $ 15 |  | $ 114
Commercial [Member] | Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 9 | 1 | 15
Post-Modification Outstanding Balance | $ 1,769 | $ 49 | $ 2,391
Commercial [Member] | Real Estate [Member] | Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 786 | 49 | 2,199
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 | $ 983 | $ 0 | $ 192
Commercial [Member] | Other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 5 | 2 | 22
Post-Modification Outstanding Balance | $ 182 | $ 53 | $ 1,208
Commercial [Member] | Other [Member] | Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance | 182 | 53 | 1,072
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 | $ 136
Residential [Member] | Construction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan |  |  | 1
Post-Modification Outstanding 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 | 3
Post-Modification Outstanding Balance |  | $ 323 | $ 988
Residential [Member] | Real Estate [Member] | Term Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance |  | 323 | 988
Residential [Member] | Real Estate [Member] | Rate Modification [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance |  | 0 | 0
Residential [Member] | Real Estate [Member] | Combination [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Balance |  | $ 0 | $ 0

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