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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 124,779 | $ 117,318 | $ 355,497 | $ 310,840
Unrealized (losses) gains on securities available for sale: |  |  |  |
Unrealized gains (losses) on securities available for sale arising during the period | 3,932 | (13,810) | 62,974 | (9,656)
Tax effect | (906) | 3,175 | (14,485) | 2,221
Reclassification adjustment for realized gains on securities available for sale included in income before income taxes | (1,136) | 0 | (6,855) | 0
Tax effect | 262 | 0 | 1,577 | 0
Total change in unrealized (losses) gains on securities available for sale, net of tax | 2,152 | (10,635) | 43,211 | (7,435)
Unrealized losses on securities available for sale transferred to held to maturity: |  |  |  |
Unrealized losses on securities available for sale transferred to held to maturity | 0 | 0 | 0 | (109,507)
Tax effect | 0 | 0 | 0 | 25,186
Reclassification adjustment for accretion of unrealized losses on securities available for sale transferred to held to maturity | 6,095 | 6,502 | 18,004 | 10,975
Tax effect | (1,402) | (1,495) | (4,141) | (2,523)
Total change in unrealized losses on securities available for sale transferred to held to maturity, net of tax | 4,693 | 5,007 | 13,863 | (75,869)
Change in pension obligation: |  |  |  |
Amortization of actuarial losses and prior service cost | 2,745 | 3,495 | 8,235 | 10,486
Tax effect | (631) | (804) | (1,894) | (2,412)
Total change in pension obligation, net of tax | 2,114 | 2,691 | 6,341 | 8,074
Net current period other comprehensive income | 8,959 | (2,937) | 63,415 | (75,230)
Total comprehensive income | $ 133,738 | $ 114,381 | $ 418,912 | $ 235,610

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