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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 142,684 | $ 124,779 | $ 353,639 | $ 355,497
Unrealized (losses) gains on securities available for sale: |  |  |  |
Unrealized gains on securities available for sale arising during the period | 9,781 | 3,932 | 182,690 | 62,974
Tax effect | (2,251) | (906) | (42,019) | (14,485)
Reclassification adjustment for realized gains on securities available for sale included in income before income taxes | (21,425) | (1,136) | (54,972) | (6,855)
Tax effect | 4,928 | 262 | 12,644 | 1,577
Total change in unrealized (losses) gains on securities available for sale, net of tax | (8,967) | 2,152 | 98,343 | 43,211
Unrealized losses on securities available for sale transferred to held to maturity: |  |  |  |
Reclassification adjustment for accretion of unrealized losses on securities available for sale transferred to held to maturity | 0 | 6,095 | 0 | 18,004
Tax effect | 0 | (1,402) | 0 | (4,141)
Total change in unrealized losses on securities available for sale transferred to held to maturity, net of tax | 0 | 4,693 | 0 | 13,863
Change in pension obligation: |  |  |  |
Amortization of actuarial losses and prior service cost | 6,332 | 2,745 | 18,994 | 8,235
Tax effect | (1,457) | (631) | (4,370) | (1,894)
Total change in pension obligation, net of tax | 4,875 | 2,114 | 14,624 | 6,341
Net current period other comprehensive (loss) income | (4,092) | 8,959 | 112,967 | 63,415
Total comprehensive income | $ 138,592 | $ 133,738 | $ 466,606 | $ 418,912

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