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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 89,192 | $ 57,983 | $ 158,648 | $ 114,253
Investment securities available for sale |  |  |  |
Net unrealized gains (losses) | (18,919) | 15,218 | (60,754) | 18,370
Net unrealized gain (loss) on available for sale securities transferred to held to maturity securities | 0 | (9,474) | 0 | (14,738)
Amortization of net unrealized gain (loss) on available for sale securities transferred to held to maturity securities | (335) | (1,548) | (632) | (2,575)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 2,015 | 0 | 2,015 | 0
Reclassification from OCI due to change in accounting principle | 0 | 0 | (84) | 0
Reclassification of certain tax effects from OCI | 0 | 0 | (8,419) | 0
Income tax (expense) benefit | 4,705 | (1,601) | 15,340 | (406)
Other comprehensive income (loss) on investment securities available for sale | (12,533) | 2,595 | (52,533) | 651
Defined benefit pension and postretirement obligations |  |  |  |
Amortization of prior service cost | 38 | 37 | (76) | 75
Amortization of actuarial loss (gains) | (465) | (487) | 929 | (975)
Reclassification of certain tax effects from OCI | 0 | 0 | (5,235) | 0
Income tax (expense) benefit | 109 | 171 | (216) | 342
Other comprehensive income (loss) on pension and postretirement obligations | 318 | 279 | (4,597) | 558
Total other comprehensive income (loss) | 12,215 | (2,874) | 57,130 | (1,209)
Comprehensive income | $ 76,977 | $ 60,857 | $ 101,518 | $ 115,462

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