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Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 134,660 | $ 69,316 | $ 202,281 | $ 121,388
Unrealized gains and losses on securities: |  |  |  |
Change in unrealized securities gains (losses) arising during period | 13,771 | 24,176 | 49,867 | 92,209
Tax effect | (5,125) | (9,261) | (18,544) | (35,277)
Reclassification adjustment for net gains realized and included in income before income taxes | (3,351) | (12,529) | (3,327) | (17,157)
Tax effect | 1,240 | 4,793 | 1,231 | 6,563
Total change in unrealized gains and losses on securities, net of tax | 6,535 | 7,179 | 29,227 | 46,338
Change in fair value of cash flow hedges: |  |  |  |
Change in unrecognized loss on cash flow hedges | 0 | 729 | 0 | 1,429
Tax effect | 0 | (274) | 0 | (537)
Total change in unrecognized loss on cash flow hedges, net of tax | 0 | 455 | 0 | 892
Change in pension obligation: |  |  |  |
Amortization of actuarial losses and prior service cost | 2,460 | 1,882 | 4,960 | 3,534
Tax effect | (897) | (719) | (1,838) | (1,351)
Total change in pension obligation, net of tax | 1,563 | 1,163 | 3,122 | 2,183
Net current period other comprehensive income | 8,098 | 8,797 | 32,349 | 49,413
Total comprehensive income | $ 142,758 | $ 78,113 | $ 234,630 | $ 170,801

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