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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net income $ 40,099 $ 38,989
Unrealized gains (losses) on available for sale debt securities:    
Net unrealized holding gains (losses) on available for sale debt securities, net of taxes of $4,801 and $(6,719) respectively (14,441) 10,786
Reclassification adjustment for realized (gains) losses on available for sale debt securities included in net income, net of taxes of $101 and $32, respectively (304) (50)
Cumulative adjustment from adoption of new accounting standards 725 0
Net change in unrealized gains (losses) on available for sale debt securities (14,020) 10,736
Unrealized gains (losses) on derivative instruments:    
Net unrealized holding gains (losses) on derivative instruments, net of taxes of $370 and $0, respectively (1,113) 0
Reclassification adjustments of net (gains) losses recognized in income 0 0
Net change in unrealized gains (losses) on derivative instruments (1,113) 0
Net change in accumulated other comprehensive income (loss) (15,133) 10,736
Total comprehensive income (loss) $ 24,966 $ 49,725