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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income $ 26,528 $ 15,924 $ 46,215 $ 28,498
Unrealized gain (loss) on securities available-for-sale:        
Unrealized gain (loss) arising during the period 7,442 (1,982) 23,280 (54)
Reclassification adjustment for (gain) loss included in net income (7,594) 0 (17,602) 1
Total change in unrealized gain (loss) on securities available-for-sale (152) (1,982) 5,678 (53)
Unrealized gain on cash flow hedge:        
Unrealized gain arising during the period 0 336 0 232
Reclassification adjustment for gain included in net income 0 0 0 0
Total change in unrealized gain on cash flow hedge 0 336 0 232
Total change in other comprehensive income (152) (1,646) 5,678 179
Comprehensive income $ 26,376 $ 14,278 $ 51,893 $ 28,677