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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Comprehensive Income Net Of Tax [Abstract]      
Unrealized holding (losses) gains on available-for-sale securities during the year, pre-tax $ (4,270) $ (1,403) $ 10,486
Reclassification adjustment for (gains) losses included in net income, pre-tax [1] (73) (94) (457)
Net unrealized holding gains (losses) (4,343) (1,497) 10,029
Change in funded status of post-retirement health plan (156) 20 60
Net other comprehensive income (loss), pre-tax (4,499) (1,477) 10,089
Unrealized holding (losses) gains on available-for-sale securities during the year, tax 1,494 491 (3,670)
Reclassification adjustment for (gains) losses included in net income, tax [1] 26 33 160
Net unrealized (losses) gains on available-for-sale securities, tax 1,520 524 (3,510)
Change in funded status of post-retirement health plan, tax 55 (7) (21)
Net other comprehensive income (loss), tax 1,575 517 (3,531)
Unrealized holding (losses) gains on available-for-sale securities during the year, after-tax (2,776) (912) 6,816
Reclassification adjustment for (gains) losses included in net income, after-tax [1] (47) (61) (297)
Unrealized holding gains (losses), net of reclassification and tax (2,823) (973) 6,519
Change in funded status of post-retirement health plan, net of tax (101) 13 39
Other comprehensive income (loss), net of tax $ (2,924) $ (960) $ 6,558
[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.