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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 93,949 | $ 87,802 | $ 83,722
Unrealized gains and losses on securities available for sale: |  |  |
Net unrealized losses arising during the period | (2,163) | (4,431) | (3,401)
Reclassification adjustment for gains included in net income | 0 | (30) | (391)
Total | (2,163) | (4,461) | (3,792)
Unrealized gains (losses) on derivatives | 379 | 242 | (73)
Amortization related to post-retirement obligations | (889) | 3,368 | 1,290
Total other comprehensive loss | (2,673) | (851) | (2,575)
Total comprehensive income | $ 91,276 | $ 86,951 | $ 81,147

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