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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
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 37,446 | $ 31,964 | $ 129,181 | $ 102,500
Securities available for sale: |  |  |  |
Unrealized holding (losses) gains on securities | (62) | (4,882) | 20,648 | (15,791)
Reclassification adjustment for losses realized in net income | 1,876 | 11 | 1,872 | 11
Total securities | 1,814 | (4,871) | 22,520 | (15,780)
Derivative instruments: |  |  |  |
Unrealized holding (losses) gains on derivative instruments | (708) | 639 | (3,164) | 1,884
Total derivative instruments | (708) | 639 | (3,164) | 1,884
Defined benefit pension and post-retirement benefit plans: |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 78 | 61 | 234 | 184
Total defined benefit pension and post-retirement benefit plans | 78 | 61 | 234 | 184
Other comprehensive income (loss), net of tax | 1,184 | (4,171) | 19,590 | (13,712)
Comprehensive income | $ 38,630 | $ 27,793 | $ 148,771 | $ 88,788

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