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Net Income Per Common Share - (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Basic        
Net income applicable to common stock $ 25,284 $ 22,900 $ 49,256 $ 44,116
Average common shares outstanding (shares) 44,415,423 42,066,168 44,390,021 41,200,133
Net income per common share - basic (usd per share) $ 0.57 $ 0.54 $ 1.11 $ 1.07
Diluted        
Net income applicable to common stock $ 25,284 $ 22,900 $ 49,256 $ 44,116
Average common shares outstanding (shares) 44,415,423 42,066,168 44,390,021 41,200,133
Effect of dilutive stock-based compensation (shares) 108,118 237,458 110,259 235,830
Average common shares outstanding - diluted (shares) 44,523,541 42,303,626 44,500,280 41,435,963
Net income per common share - diluted (usd per share) $ 0.57 $ 0.54 $ 1.11 $ 1.06