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Consolidated Statements of Comprehensive Income - Unaudited - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 15,440	$ 24,142
Unrealized gains (losses) on available-for-sale debt securities:
Unrealized gains (losses) arising during the period	17,817	(34,098)
Income tax effect	(4,632)	8,865
Net unrealized gains (losses) on available-for-sale debt securities	13,185	(25,233)
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) arising during the period	(6,939)	873
Income tax effect	1,804	(227)
Reclassification adjustment for (gains) losses included in net income	(413)	131
Income tax effect	107	(34)
Net unrealized gains (losses) on cash flow hedges	(5,441)	743
Other comprehensive income (loss), net of income tax effect	7,744	(24,490)
Comprehensive income (loss)	$ 23,184	$ (348)

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