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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	$ 78,837	$ 78,702	$ 58,583
Unrealized gains (losses) on available-for-sale securities:
Unrealized gains (losses) arising during the period	12,266	(3,335)	(10,140)
Income tax effect	(4,378)	1,317	3,759
Reclassification adjustments for (gains) losses included in net income	(8,800)	7,237	85
Income tax effect	3,432	(2,714)	(32)
Net unrealized gains (losses) on available-for-sale securities	2,520	2,505	(6,328)
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) arising during the period	666	(1,093)	(2,532)
Income tax effect	(260)	464	998
Reclassification adjustment for losses included in net income	2,634	1,946	0
Income tax effect	(1,027)	(730)	0
Net unrealized gains (losses) on cash flow hedges	2,013	587	(1,534)
Other comprehensive income (loss), net of income tax effect	4,533	3,092	(7,862)
Comprehensive income	$ 83,370	$ 81,794	$ 50,721

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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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