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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 31,964 | $ 26,421 | $ 102,500 | $ 75,677
Securities available for sale: |  |  |  |
Unrealized holding (losses) gains on securities | (4,882) | (729) | (15,791) | 4,747
Reclassification adjustment for losses (gains) realized in net income | 11 | (35) | 11 | (35)
Unrealized holding gains on securities transferred from held to maturity to available for sale | 0 | 8,108 | 0 | 8,108
Amortization of unrealized holding gains on securities transferred to the held to maturity category | 0 | (4) | 0 | (173)
Total securities | (4,871) | 7,340 | (15,780) | 12,647
Derivative instruments: |  |  |  |
Unrealized holding gains on derivative instruments | 639 | 100 | 1,884 | 104
Total derivative instruments | 639 | 100 | 1,884 | 104
Defined benefit pension and post-retirement benefit plans: |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 61 | 62 | 184 | 187
Total defined benefit pension and post-retirement benefit plans | 61 | 62 | 184 | 187
Other comprehensive (loss) income, net of tax | (4,171) | 7,502 | (13,712) | 12,938
Comprehensive income | $ 27,793 | $ 33,923 | $ 88,788 | $ 88,615

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