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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred income tax - unrealized gains (losses) on available for sale securities |  | $ (685) | $ (184)
Deferred income tax - pension adjustments |  | (36) | (1,716)
Pre-1988 tax bad debt reserve |  | $ 6,869 | $ 6,869
State income tax rate effective (as a percent) |  | 4.00% | 5.00%
Increase decrease in deferred income tax expense |  | $ 118 | $ (3,541)
Scenario, Forecast [Member] |  |  |
State income tax rate effective (as a percent) | 3.00% |  |

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- Definition Deferred tax expense (benefit) related to pension adjustments. + References No definition available. + Details
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- Definition Deferred tax expense (benefit) related to unrealized gains and losses on available for sale securities. + References No definition available. + Details
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- Definition The amount of pre-1988 tax bad debt reserve base years amounts included in retained earnings. + References No definition available. + Details
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- Definition The percentage of state income tax rate effective from next fiscal year. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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