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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 111,359 | $ 100,231
Unrealized (losses) gains on securities available for sale: |  |
Change in unrealized (losses) gains on securities available for sale arising during period | 28,071 | (78,635)
Tax effect | (6,456) | 18,088
Total change in unrealized (losses) gains on securities available for sale, net of tax | 21,615 | (60,547)
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 | 5,962 | 0
Tax effect | (1,371) | 0
Total change in unrealized losses on securities available for sale transferred to held to maturity, net of tax | 4,591 | 0
Change in pension obligation: |  |
Amortization of actuarial losses and prior service cost | 2,755 | 3,337
Tax effect | (634) | (768)
Total change in pension obligation, net of tax | 2,121 | 2,569
Net current period other comprehensive income | 28,327 | (57,978)
Total comprehensive income | $ 139,686 | $ 42,253

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