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Consolidated Statements of Comprehensive Income - Unaudited - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income from continuing operations $ 28,952 $ 21,774 $ 55,876 $ 41,082
Net loss from discontinued operations (5,230) (2,291) (6,407) (3,415)
Net income 23,722 19,483 49,469 37,667
Unrealized gains on available-for-sale securities:        
Unrealized holding gains on securities arising during the period 19,885 8,059 18,762 14,926
Income tax effect (7,755) (3,022) (7,317) (5,597)
Reclassification adjustments for gains on securities included in net income (3,183) 0 (3,183) (26)
Income tax effect 1,241 0 1,241 10
Net unrealized gains on available-for-sale securities 10,188 5,037 9,503 9,313
Unrealized gains (losses) on cash flow hedges:        
Unrealized losses arising during the period (689) (813) (360) (3,413)
Income tax effect 269 305 141 1,280
Reclassification adjustment for losses included in net income 767 603 1,594 603
Income tax effect (299) (226) (622) (226)
Net unrealized gains (losses) on cash flow hedges 48 (131) 753 (1,756)
Other comprehensive income, net of income tax effect 10,236 4,906 10,256 7,557
Comprehensive income $ 33,958 $ 24,389 $ 59,725 $ 45,224