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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Unrealized gains and losses on securities available for sale:
Net unrealized gains (losses) arising during the period	479	(1,541)	2,478	8,533
Reclassification adjustment for gains included in net income	0	26	0	(32)
Total	479	(1,515)	2,478	8,501
Unrealized gains (losses) on derivatives	54	230	106	(361)
Amortization related to post-retirement obligations	36	141	105	380
Total other comprehensive income (loss)	569	(1,144)	2,689	8,520
Total comprehensive income	$ 27,144	$ 21,762	$ 77,155	$ 73,755

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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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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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