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Consolidated Statements of Comprehensive Income (Loss) - Unaudited - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ 24,142 $ 25,747
Unrealized losses on available-for-sale debt securities:    
Unrealized losses arising during the period (34,098) (1,123)
Income tax effect 8,865 438
Net unrealized losses on available-for-sale debt securities (25,233) (685)
Unrealized gains on cash flow hedges:    
Unrealized gains arising during the period 873 329
Income tax effect (227) (128)
Reclassification adjustment for losses included in net income 131 827
Income tax effect (34) (323)
Net unrealized gains on cash flow hedges 743 705
Other comprehensive (loss) income, net of income tax effect (24,490) 20
Comprehensive income (loss) $ (348) $ 25,767