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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Comprehensive Income Net Of Tax [Abstract]      
Unrealized holding gains (losses) on available-for-sale securities during the year, pre-tax $ 17,513 $ (5,343) $ 5,107
Reclassification adjustment for gains included in net income, pre-tax [1] 11 (283) (4)
Net unrealized holding gains (losses) 17,524 (5,626) 5,103
Change in funded status of post-retirement health plan, pre-tax 0 0 (55)
Net other comprehensive income (loss), pre-tax 17,524 (5,626) 5,048
Unrealized holding gains (losses) on available-for-sale securities during the year, tax (3,666) 1,110 (1,788)
Reclassification adjustment for gains included in net income, tax [1] (2) 59 2
Net unrealized gains (losses) on available-for-sale securities, tax (3,668) 1,169 (1,786)
Change in funded status of post-retirement health plan, tax 0 0 19
Net other comprehensive income (loss), tax (3,668) 1,169 (1,767)
Unrealized holding gains (losses) on available-for-sale securities during the year, after tax 13,847 (4,233) 3,319
Reclassification adjustment for gains included in net income, after-tax [1] 9 (224) (2)
Unrealized holding gains (losses), net of reclassification and tax 13,856 (4,457) 3,317
Change in funded status of post-retirement health plan, after-tax 0 0 (36)
Other comprehensive income (loss), net of tax $ 13,856 $ (4,457) $ 3,281
[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.