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Consolidated Statements of Comprehensive Income - Unaudited - 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	$ 7,754	$ 21,207	$ 57,222	$ 58,875
Unrealized (losses) gains on available-for-sale securities:
Unrealized holding (losses) gains on securities arising during the period	(3,570)	329	15,192	15,256
Income tax effect	1,393	(124)	(5,924)	(5,721)
Reclassification adjustments for (gains) losses on securities included in net income	(5,349)	1	(8,532)	(25)
Income tax effect	2,086	0	3,327	9
Net unrealized (losses) gains on available-for-sale securities	(5,440)	206	4,063	9,519
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) arising during the period	171	890	(189)	(2,523)
Income tax effect	(67)	(334)	74	946
Reclassification adjustment for losses included in net income	572	703	2,166	1,306
Income tax effect	(223)	(264)	(845)	(490)
Net unrealized gains (losses) on cash flow hedges	453	995	1,206	(761)
Other comprehensive (loss) income, net of income tax effect	(4,987)	1,201	5,269	8,758
Comprehensive income	$ 2,767	$ 22,408	$ 62,491	$ 67,633

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