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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net income | $ 88,277 | $ 71,177 | $ 167,441 | $ 143,652
Other comprehensive income/loss before income taxes: |  |  |  |
Net change in unrealized gain/loss on securities available for sale and cash flow hedges | 69,225 | (23,409) | 126,468 | (85,653)
Reclassification of net losses realized and included in earnings | 3,984 | 2,217 | 8,203 | 4,013
Other Valuation Adjustments for employee benefit plan |  | (9,039) |  | (9,039)
Amortization of unrealized net loss on securities transferred to held to maturity | 890 | 925 | 1,481 | 1,680
Other comprehensive income/loss before income taxes | 74,099 | (29,306) | 136,152 | (88,999)
Income tax expense (benefit) | 16,793 | (6,646) | 30,646 | (20,192)
Other comprehensive income/loss net of income taxes | 57,306 | (22,660) | 105,506 | (68,807)
Comprehensive income | $ 145,583 | $ 48,517 | $ 272,947 | $ 74,845

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