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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Comprehensive Income Net Of Tax [Abstract]        
Unrealized holding gains on available-for-sale securities during the period, pre-tax $ 5,946 $ 5,020 $ 6,321 $ 8,377
Reclassification adjustment for (gains) losses included in net income, pre-tax [1] 14 (41) 1 (41)
Net unrealized holding gains 5,960 4,979 6,322 8,336
Net other comprehensive income (loss), pre-tax     6,322  
Unrealized holding gains on available-for-sale securities during the period, tax (2,081) (1,759) (2,214) (2,934)
Reclassification adjustment for (gains) losses included in net income, tax [1] (6) 14 (1) 14
Net unrealized gains on available-for-sale securities, tax (2,087) (1,745) (2,215) (2,920)
Net other comprehensive income (loss), tax     (2,215)  
Unrealized holding gains on available-for-sale securities during the period, after-tax 3,865 3,261 4,107 5,443
Reclassification adjustment for (gains) losses included in net income, after-tax [1] 8 (27) 0 (27)
Net unrealized gains on available-for-sale securities, after-tax 3,873 3,234   5,416
Other comprehensive income, net of tax $ 3,873 $ 3,234 $ 4,107 $ 5,416
[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.