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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 15,924 $ 8,099 $ 28,498 $ 8,848
Unrealized gain on available for sale securities:        
Unrealized (loss) gain arising during the period (1,982) 1,099 (54) 2,122
Reclassification adjustment for loss (gain) included in net income 0 (15) 1 (522)
Total change in unrealized gain on available for sale securities (1,982) 1,084 (53) 1,600
Unrealized gain (loss) on cash flow hedge:        
Unrealized gain (loss) arising during the period 336 (292) 232 (509)
Total change in unrealized gain (loss) on cash flow hedge 336 (292) 232 (509)
Total change in other comprehensive income (1,646) 792 179 1,091
Comprehensive income $ 14,278 $ 8,891 $ 28,677 $ 9,939