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Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 400,313 | $ 323,752 | $ 225,482
Unrealized gains (losses) on securities available for sale: |  |  |
Change in unrealized gains (losses) on securities available for sale arising during period | 29,170 | 28,166 | (21,530)
Tax effect | (6,709) | (10,531) | 7,584
Reclassification adjustment for gains included in income before income taxes | (351) | (4,293) | (26,673)
Tax effect | 81 | 1,588 | 9,869
Total change in unrealized gains (losses) on securities available for sale, net of tax | 22,191 | 14,930 | (30,750)
Unrealized losses on securities available for sale transferred to held to maturity [Abstract] |  |  |
Unrealized losses on securities available for sale transferred to held to maturity | (109,507) | 0 | 0
Tax effect | 25,186 | 0 | 0
Reclassification adjustment for accretion of unrealized losses on securities available for sale transferred to held to maturity | 17,106 | 0 | 0
Tax effect | (3,934) | 0 | 0
Total change in unrealized losses on securities available for sale transferred to held to maturity, net of tax | (71,149) | 0 | 0
Change in fair value of cash flow hedges: |  |  |
Change in unrecognized loss on cash flow hedges | 0 | 0 | 1,429
Tax effect | 0 | 0 | (537)
Total change in unrecognized loss on cash flow hedges, net of tax | 0 | 0 | 892
Change in pension obligation: |  |  |
Increase in pension obligation | (32,012) | (12,945) | (70,424)
Tax effect | 7,363 | 4,789 | 25,077
Amortization of actuarial losses and prior service cost | 13,981 | 9,720 | 7,069
Tax effect | (3,216) | (3,596) | (2,616)
Total change in pension obligation, net of tax | (13,884) | (2,032) | (40,894)
Net current period other comprehensive income (loss) | (62,842) | 12,898 | (70,752)
Total comprehensive income | $ 337,471 | $ 336,650 | $ 154,730

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