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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 167,596 | $ 146,920 | $ 92,188
Securities available for sale: |  |  |
Unrealized holding gains (losses) on securities | 18,625 | (8,315) | (2,218)
Reclassification adjustment for losses (gains) realized in net income | 1,872 | 12 | (91)
Unrealized holding gains on securities transferred from held to maturity to available for sale | 0 | 0 | 8,108
Amortization of unrealized holding gains on securities transferred to the held to maturity category | 0 | 0 | (173)
Total securities available for sale | 20,497 | (8,303) | 5,626
Derivative instruments: |  |  |
Unrealized holding (losses) gains on derivative instruments | (2,217) | 365 | 536
Total derivative instruments | (2,217) | 365 | 536
Defined benefit pension and post-retirement benefit plans: |  |  |
Net gain arising during the period | 68 | 308 | 1,028
Amortization of net actuarial loss recognized in net periodic pension cost | 312 | 245 | 249
Total defined benefit pension and post-retirement benefit plans | 380 | 553 | 1,277
Other comprehensive income (loss), net of tax | 18,660 | (7,385) | 7,439
Comprehensive income | $ 186,256 | $ 139,535 | $ 99,627

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