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Consolidated Statements of Comprehensive Income (Loss) - Unaudited - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 9,296	$ 23,663	$ 24,735	$ 47,804
Unrealized gains (losses) on available-for-sale debt securities:
Unrealized gains (losses) arising during the period	20,755	(12,190)	38,572	(46,288)
Income tax effect	(5,397)	3,170	(10,029)	12,035
Net unrealized gains (losses) on available-for-sale debt securities	15,358	(9,020)	28,543	(34,253)
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) arising during the period	(14,102)	1,895	(21,041)	2,768
Income tax effect	3,667	(492)	5,471	(719)
Reclassification adjustment for (gains) losses included in net income	4	(259)	(409)	(128)
Income tax effect	(1)	67	106	33
Net unrealized gains (losses) on cash flow hedges	(10,432)	1,211	(15,873)	1,954
Other comprehensive income (loss), net of income tax effect	4,926	(7,809)	12,670	(32,299)
Comprehensive income (loss)	$ 14,222	$ 15,854	$ 37,405	$ 15,505

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