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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Comprehensive Income Net Of Tax [Abstract]      
Unrealized holding (losses) gains on available-for-sale securities during the year, pre-tax $ 5,107 $ (4,270) $ (1,403)
Reclassification adjustment for (gains) losses included in net income, pre-tax [1] (4) (73) (94)
Net unrealized holding gains (losses) 5,103 (4,343) (1,497)
Change in funded status of post-retirement health plan, pre-tax (55) (156) 20
Net other comprehensive income (loss), pre-tax 5,048 (4,499) (1,477)
Unrealized holding (losses) gains on available-for-sale securities during the year, tax (1,788) 1,494 491
Reclassification adjustment for (gains) losses included in net income, tax [1] 2 26 33
Net unrealized (losses) gains on available-for-sale securities, tax (1,786) 1,520 524
Change in funded status of post-retirement health plan, tax 19 55 (7)
Net other comprehensive income (loss), tax (1,767) 1,575 517
Unrealized holding (losses) gains on available-for-sale securities during the year, after-tax 3,319 (2,776) (912)
Reclassification adjustment for (gains) losses included in net income, after-tax [1] (2) (47) (61)
Unrealized holding gains (losses), net of reclassification and tax 3,317 (2,823) (973)
Change in funded status of post-retirement health plan, net of tax (36) (101) 13
Other comprehensive income (loss), net of tax $ 3,281 $ (2,924) $ (960)
[1] Pre-tax reclassification adjustments relating to available-for-sale securities are reported in security gains and the tax impact is included in income tax expense on the consolidated statements of income.