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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Comprehensive Income Net Of Tax [Abstract]      
Unrealized holding (losses) gains on available-for-sale securities during the year, pre-tax $ (5,343) $ 5,107 $ (4,270)
Reclassification adjustment for gains included in net income [1] (283) (4) (73)
Net unrealized holding gains (losses) (5,626) 5,103 (4,343)
Change in funded status of post-retirement health plan, pre-tax 0 (55) (156)
Net other comprehensive income (loss), pre-tax (5,626) 5,048 (4,499)
Unrealized holding (losses) gains on available-for-sale securities during the year, tax 1,110 (1,788) 1,494
Reclassification adjustment for gains included in net income [1] 59 2 26
Net unrealized (losses) gains on available-for-sale securities, tax 1,169 (1,786) 1,520
Change in funded status of post-retirement health plan, tax 0 19 55
Net other comprehensive income (loss), tax 1,169 (1,767) 1,575
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax (4,233) 3,319 (2,776)
Reclassification adjustment for gains included in net income [1] (224) (2) (47)
Unrealized holding gains (losses), net of reclassification and tax (4,457) 3,317 (2,823)
Change in funded status of post-retirement health plan, net of tax 0 (36) (101)
Other comprehensive income (loss), net of tax $ (4,457) $ 3,281 $ (2,924)
[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.