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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 22, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory federal tax rate |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  | 35.00% | 35.00%
Change in corporate federal statutory income tax rate |  |  | 21.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforward | [1] |  |  | $ 76 |  |  |  |  | $ 169 |  |  |  | $ 76 |  | $ 169 |
Amounts of tax benefits that would affect effective tax rate if recognized |  |  |  | 1,464 |  |  |  |  | 1,225 |  |  |  | 1,464 |  | 1,225 | $ 861
Income tax accrued interest |  |  |  | 139 |  |  |  |  | 108 |  |  |  | 139 |  | 108 | 54
Increase (reduction) in accrued interest |  |  |  |  |  |  |  |  |  |  |  |  | 31 |  | 54 |
Reduction of tax benefits over the next twelve months |  |  |  |  |  |  |  |  |  |  |  |  | 299 |  |  |
Income tax expense |  |  |  | 3,576 | [2] | $ 2,396 | $ 2,248 | $ 1,665 | $ 1,806 | $ 1,855 | $ 2,035 | $ 2,020 | $ 9,885 | [2] | $ 7,716 | $ 7,978
Percentage of pre-tax income tax rate |  |  |  |  |  |  |  |  |  |  |  |  | 28.00% |  | 24.00% | 26.00%
Non-cash charge |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,824 |  |  |
Deferred tax inventory net credit amount |  |  |  | 462 |  |  |  |  |  |  |  |  | 462 |  |  |
Change in AOCI related to pension and unrealized gains/losses on securities available for sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,286 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in corporate federal statutory income tax rate |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of one time charge |  |  |  |  |  |  |  |  |  |  |  |  | 28.00% |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of one time charge |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Franklin Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforward |  |  |  | 361 |  |  |  |  |  |  |  |  | $ 361 |  |  |
Limitations on use |  |  |  | $ 122 |  |  |  |  |  |  |  |  | $ 122 |  |  |
Net operating loss carryforward expiration date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2020 |  |  |
[1] | As of December 31, 2017, the Company had approximately $361,000 of net operating loss carry forwards as a result of the acquisition of Franklin Bancorp. The utilization of the net operating loss carry forward is subject to Section 382 of the Internal Revenue Code and limits the Company's use to approximately $122,000 per year during the carry forward period, which expires in 2020.
[2] | Includes one-time, non-cash TCJA charge of $1,824,000

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