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Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 457,371 | $ 400,313 | $ 323,752
Unrealized gains on securities available for sale: |  |  |
Unrealized gains on securities available for sale arising during the period | 64,644 | 29,170 | 28,166
Tax effect | (14,868) | (6,709) | (10,531)
Reclassification adjustment for realized gains on securities available for sale included in income before income taxes | (7,115) | (351) | (4,293)
Tax effect | 1,636 | 81 | 1,588
Unrealized gains on securities available for sale arising during the period, net of tax | 44,297 | 22,191 | 14,930
Unrealized losses on securities available for sale transferred to held to maturity [Abstract] |  |  |
Unrealized losses on securities available for sale transferred from (to) held to maturity | 72,512 | (109,507) | 0
Tax effect | (16,678) | 25,186 | 0
Reclassification adjustment for accretion of unrealized losses on securities available for sale transferred to held to maturity | 19,889 | 17,106 | 0
Tax effect | (4,574) | (3,934) | 0
Total change in unrealized losses on securities available for sale transferred from (to) held to maturity, net of tax | 71,149 | (71,149) | 0
Change in fair value of cash flow hedges: |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | 20,049 | 32,012 | 12,945
Defined benefit pension items: |  |  |
Actuarial losses arising during the period | (20,049) | (32,012) | (12,945)
Tax effect | 4,611 | 7,363 | 4,789
Amortization of actuarial losses and prior service cost | 10,981 | 13,981 | 9,720
Tax effect | (2,525) | (3,216) | (3,596)
Total change from defined benefit plans, net of tax | 6,982 | 13,884 | 2,032
Net current period other comprehensive income (loss) | 108,464 | (62,842) | 12,898
Total comprehensive income | $ 565,835 | $ 337,471 | $ 336,650

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