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Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract] |  |  |  |
Net income | $ 32,379 | $ 29,807 | $ 92,061 | $ 83,914
Securities available for sale: |  |  |  |
Unrealized net holding gains (losses) arising during the period, gross | 2,360 | (5,798) | 26,787 | (26,605)
Tax effect | (590) | 1,449 | (6,697) | 6,651
Unrealized net holding gains (losses) arising during the period, net | 1,770 | (4,349) | 20,090 | (19,954)
Reclassification adjustment for net (gains) losses in net income, gross | (20) | 0 | 79 | 0
Tax effect | 5 | 0 | (20) | 0
Reclassification adjustment for net (gains) losses in net income, net | (15) | 0 | 59 | 0
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross | 190 | 168 | 556 | 533
Tax effect | (47) | (42) | (139) | (133)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net | 143 | 126 | 417 | 400
Total securities available for sale, net | 1,898 | (4,223) | 20,566 | (19,554)
Cash flow hedges: |  |  |  |
Unrealized gains (losses) on derivatives (cash flow hedges), gross | 9 | 175 | (475) | 1,647
Tax effect | (2) | (44) | 119 | (412)
Unrealized gains (losses) on derivatives (cash flow hedges), net | 7 | 131 | (356) | 1,235
Reclassification of net unrealized (gains) on cash flow hedges to interest (income), gross | (395) | (638) | (1,932) | (1,537)
Tax effect | 98 | 159 | 483 | 384
Reclassification of net unrealized (gains) on cash flow hedges to interest (income), net | (297) | (479) | (1,449) | (1,153)
Total cash flow hedges, net | (290) | (348) | (1,805) | 82
Pension and other benefits: |  |  |  |
Amortization of prior service cost and actuarial losses, gross | 672 | 286 | 1,985 | 876
Tax effect | (168) | (71) | (496) | (219)
Amortization of prior service cost and actuarial losses, net | 504 | 215 | 1,489 | 657
Total pension and other benefits, net | 504 | 215 | 1,489 | 657
Total other comprehensive income (loss) | 2,112 | (4,356) | 20,250 | (18,815)
Comprehensive income | $ 34,491 | $ 25,451 | $ 112,311 | $ 65,099

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