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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 71,695	$ 78,837	$ 78,702
Unrealized gains (losses) on available-for-sale securities:
Unrealized (losses) gains arising during the period	(46,069)	12,266	(3,335)
Income tax effect	11,978	(4,378)	1,317
Reclassification adjustments for losses (gains) included in net income	18,659	(8,800)	7,237
Income tax effect	(4,851)	3,432	(2,714)
Net unrealized (losses) gains on available-for-sale securities	(20,283)	2,520	2,505
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) arising during the period	1,995	666	(1,093)
Income tax effect	(518)	(260)	464
Reclassification adjustment for (gains) losses included in net income	(2,917)	2,634	1,946
Income tax effect	758	(1,027)	(730)
Net unrealized (losses) gains on cash flow hedges	(682)	2,013	587
Other comprehensive (loss) income, net of income tax effect	(20,965)	4,533	3,092
Comprehensive income	$ 50,730	$ 83,370	$ 81,794

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