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Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 52,072 | $ 67,158
Unrealized gains and losses on securities: |  |
Change in unrealized securities gains (losses) arising during period | 68,033 | 30,415
Tax effect | (26,016) | (11,813)
Reclassification adjustment for net gains realized and included in income before income taxes | 4,628 | 5,126
Tax effect | 1,770 | 1,977
Total change in unrealized gains and losses on securities, net of tax | 39,159 | 15,453
Change in fair value of cash flow hedges: |  |
Change in unrecognized loss on cash flow hedges | 700 | 576
Tax effect | (263) | (222)
Total change in unrecognized loss on cash flow hedges, net of tax | 437 | 354
Change in pension obligation: |  |
Amortization of actuarial losses and prior service cost | 1,652 | 2,886
Tax effect | (632) | (1,123)
Total change in pension obligation, net of tax | 1,020 | 1,763
Net current period other comprehensive income | 40,616 | 17,570
Total comprehensive income | $ 92,688 | $ 84,728

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