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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Comprehensive Income [Abstract] |  |  |
Net Income | $ 59,590 | $ 50,143 | $ 44,453
Other comprehensive (loss) income, before tax (benefit) expense: |  |  |
Unrealized holding (losses) gains on securities arising during the period | (6,304) | 2,798 | 25,153
Less: reclassification adjustment for (gains) losses on securities included in net income | (617) | 153 | (550)
Unrealized holding (losses) gains on derivatives arising during the period | (479) | 450 | 472
Reclassification adjustment for gains on derivatives included in net income | (70) | (49) | (10)
Unrealized gains (losses) for postretirement obligation: |  |  |
Transition obligation | 0 | 0 | 0
Net gain (loss) | 331 | (102) | (313)
Total other comprehensive (loss) income, before income tax (benefit) expense | (7,139) | 3,250 | 24,752
Income tax (benefit) expense related to items of other comprehensive (loss) income | (2,498) | 1,137 | 8,663
Comprehensive Income | $ 54,949 | $ 52,256 | $ 60,542

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