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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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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.

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