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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 | $ 171,753 | $ 161,625 | $ 149,502
Unrealized (losses) gains on available for sale investment securities: |  |  |
Unrealized gain (loss) on securities | 10,432 | (14,891) | (7,717)
Reclassification adjustment for securities gains included in net income | (5,894) | (1,657) | (5,892)
Non-credit related unrealized gain (loss) on other-than-temporarily impaired debt securities | 185 | (185) | 239
Net unrealized gains (losses) on available for sale investment securities | 4,723 | (16,733) | (13,370)
Unrealized gains on derivative financial instruments: |  |  |
Amortization of unrealized loss on derivative financial instruments | 0 | 16 | 75
Reclassification adjustment for loss on derivative financial instruments included in net income | 0 | 0 | 2,456
Net unrealized gains on derivative financial instruments | 0 | 16 | 2,531
Defined benefit pension plan and postretirement benefits: |  |  |
Unrecognized pension and postretirement (cost) income | (609) | (931) | 4,680
Amortization of net unrecognized pension and postretirement income | 1,361 | 1,216 | 1,864
Net unrealized gains on defined benefit pension and postretirement plans | 752 | 285 | 6,544
Other Comprehensive Income (Loss) | 5,475 | (16,432) | (4,295)
Total Comprehensive Income | $ 177,228 | $ 145,193 | $ 145,207

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