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Consolidated Statements of Comprehensive Income (Unaudited) - 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 | $ 36,710 | $ 25,284 | $ 70,536 | $ 49,256
Securities available for sale: |  |  |  |
Unrealized holding (losses) gains on securities | (3,000) | 2,569 | (10,909) | 5,476
Amortization of unrealized holding gains on securities transferred to the held to maturity category | 0 | (18) | 0 | (169)
Total securities | (3,000) | 2,551 | (10,909) | 5,307
Derivative instruments: |  |  |  |
Unrealized holding gains (losses) on derivative instruments | 387 | (165) | 1,245 | 4
Total derivative instruments | 387 | (165) | 1,245 | 4
Defined benefit pension and post-retirement benefit plans: |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 57 | 56 | 123 | 125
Total defined benefit pension and post-retirement benefit plans | 57 | 56 | 123 | 125
Other comprehensive (loss) income, net of tax | (2,556) | 2,442 | (9,541) | 5,436
Comprehensive income | $ 34,154 | $ 27,726 | $ 60,995 | $ 54,692

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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