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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	$ 24,826	$ 22,850	$ 71,976	$ 65,232
Other comprehensive (loss) income, net of tax
Unrealized gains (losses) on investment securities arising during the period	1,501	(162)	7,064	12,073
Change in retirement obligation	213	200	615	601
Unrealized gain (loss) on derivatives	129	128	385	384
Other comprehensive income (loss)	1,843	166	8,064	13,058
Comprehensive income	$ 26,669	$ 23,016	$ 80,040	$ 78,290

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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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