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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net Income | $ 55,165 | $ 59,590 | $ 50,143
Other comprehensive income (loss), before tax expense (benefit): |  |  |
Unrealized holding gains (losses) on securities arising during the period | 7,023 | (6,304) | 2,798
Less: reclassification adjustment for (gains) losses on securities included in net income | (5,040) | (617) | 153
Unrealized holding (losses) gains on derivatives arising during the period | (901) | (479) | 450
Reclassification adjustment for losses on derivatives included in net income | 119 | (70) | (49)
Unrealized gains (losses) for postretirement obligation: |  |  |
Net gain (loss) | 94 | 331 | (102)
Total other comprehensive income (loss), before income tax expense (benefit) | 1,295 | (7,139) | 3,250
Income tax expense (benefit) related to items of other comprehensive income (loss) | 441 | (2,498) | 1,137
Comprehensive Income | $ 56,019 | $ 54,949 | $ 52,256

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