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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Statement of Comprehensive Income [Abstract] |  |  |
Net Income | $ 149,502 | $ 157,894 | $ 161,840
Unrealized (losses) gains on available for sale investment securities: |  |  |
Unrealized (loss) gain on securities | (7,717) | 33,734 | (49,607)
Reclassification adjustment for securities gains included in net income | (5,892) | (1,327) | (5,203)
Non-credit related unrealized gain on other-than-temporarily impaired debt securities | 239 | 780 | 1,977
Net unrealized (losses) gains on available for sale investment securities | (13,370) | 33,187 | (52,833)
Unrealized gains on derivative financial instruments: |  |  |
Unrealized gain on derivative financial instruments | 75 | 136 | 136
Reclassification adjustment for loss on derivative financial instruments included in net income | 2,456 | 0 | 0
Net unrealized gains on derivative financial instruments | 2,531 | 136 | 136
Defined benefit pension plan and postretirement benefits: |  |  |
Unrecognized pension and postretirement income (cost) | 4,680 | (13,168) | 8,369
Amortization of net unrecognized pension and postretirement income | 1,864 | 408 | 1,312
Non-credit related unrealized gain on other-than-temporarily impaired debt securities | 0 | (944) | 0
Net unrealized gains (losses) on pension and postretirement plans | 6,544 | (13,704) | 9,681
Other Comprehensive (Loss) Income | (4,295) | 19,619 | (43,016)
Total Comprehensive Income | $ 145,207 | $ 177,513 | $ 118,824

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