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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Comprehensive Income [Abstract] |  |  |
Net Income | $ 161,625 | $ 149,502 | $ 157,894
Unrealized (losses) gains on available for sale investment securities: |  |  |
Unrealized (loss) gain on securities | (14,891) | (7,717) | 33,734
Reclassification adjustment for securities gains included in net income | (1,657) | (5,892) | (1,327)
Non-credit related unrealized (loss) gain on other-than-temporarily impaired debt securities | (185) | 239 | 780
Net unrealized (losses) gains on available for sale investment securities | (16,733) | (13,370) | 33,187
Unrealized gains on derivative financial instruments: |  |  |
Amortization of unrealized loss on derivative financial instruments | 16 | 75 | 136
Reclassification adjustment for loss on derivative financial instruments included in net income | 0 | 2,456 | 0
Net unrealized gains on derivative financial instruments | 16 | 2,531 | 136
Defined benefit pension plan and postretirement benefits: |  |  |
Unrecognized pension and postretirement (cost) income | (931) | 4,680 | (13,168)
Amortization of net unrecognized pension and postretirement income | 1,216 | 1,864 | 408
Non-credit related unrealized (loss) gain on other-than-temporarily impaired debt securities | 0 | 0 | (944)
Net unrealized gains (losses) on pension and postretirement plans | 285 | 6,544 | (13,704)
Other Comprehensive (Loss) Income | (16,432) | (4,295) | 19,619
Total Comprehensive Income | $ 145,193 | $ 145,207 | $ 177,513

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