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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 14,536 $ 11,247 $ 43,034 $ 20,095
Unrealized gain on available for sale securities:        
Unrealized gain (loss) arising during the period 2,144 (980) 2,090 1,142
Reclassification adjustment for gain included in net income (1,015) 0 (1,014) (522)
Total change in unrealized gain (loss) on available for sale securities 1,129 (980) 1,076 620
Unrealized gain (loss) on cash flow hedge:        
Unrealized (loss) gain arising during the period (628) 388 (396) (121)
Reclassification adjustment for loss included in net income 532 0 532 0
Total change in unrealized (loss) gain on cash flow hedge (96) 388 136 (121)
Total change in other comprehensive income (loss) 1,033 (592) 1,212 499
Comprehensive income $ 15,569 $ 10,655 $ 44,246 $ 20,594