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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Comprehensive Income Net Of Tax [Abstract]    
Unrealized holding gains on available-for-sale securities during the period, pre-tax $ 375 $ 3,357
Reclassification adjustment for (gains) losses included in net income, pre-tax [1] (13) 0
Net unrealized holding gains 362 3,357
Unrealized holding gains on available-for-sale securities during the period, tax (132) (1,175)
Reclassification adjustment for (gains) losses included in net income, tax [1] 4 0
Net unrealized gains on available-for-sale securities, tax (128) (1,175)
Unrealized holding gains on available-for-sale securities during the period, after-tax 243 2,182
Reclassification adjustment for (gains) losses included in net income, after-tax [1] (9) 0
Net unrealized gains on available-for-sale securities, after-tax $ 234 $ 2,182
[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.