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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 152,788 | $ 153,786 | $ 300,104 | $ 210,955
Unrealized (losses) gains on securities available for sale: |  |  |  |
Unrealized gains (losses) on securities available for sale arising during the period | 24,598 | 28,066 | (31,903) | 172,909
Tax effect | (5,658) | (6,455) | 7,337 | (39,768)
Reclassification adjustment for realized gains on securities available for sale included in income before income taxes | (15,830) | (13,752) | (25,037) | (33,547)
Tax effect | 3,641 | 3,163 | 5,759 | 7,716
Total change in unrealized (losses) gains on securities available for sale, net of tax | 6,751 | 11,022 | (43,844) | 107,310
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 | (785) | 0 | (1,260) | 0
Tax effect | 181 | 0 | 290 | 0
Total change in unrealized losses on securities available for sale transferred to held to maturity, net of tax | (604) | 0 | (970) | 0
Change in pension obligation: |  |  |  |
Amortization of actuarial losses | 7,018 | 6,398 | 13,547 | 12,662
Tax effect | (1,614) | (1,472) | (3,116) | (2,913)
Total change in pension obligation, net of tax | 5,404 | 4,926 | 10,431 | 9,749
Net current period other comprehensive (loss) income | 11,551 | 15,948 | (34,383) | 117,059
Total comprehensive income | $ 164,339 | $ 169,734 | $ 265,721 | $ 328,014

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