Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 8,126	$ 7,287	$ 26,484	$ 17,932
Weighted average shares outstanding-basic (shares)	45,492,713	44,556,682	45,257,199	44,282,476
Effect of non-vested restricted stock and stock options outstanding (shares)	1,248,510	1,164,070	1,577,148	1,272,785
Weighted average shares outstanding-diluted (shares)	46,741,223	45,720,752	46,834,347	45,555,261
Earnings per share-basic (usd per share)	$ 0.18	$ 0.16	$ 0.59	$ 0.40
Earnings per share-diluted (usd per share)	$ 0.17	$ 0.16	$ 0.57	$ 0.39
Anti-dilutive shares (shares)	1,091,464	1,020,340	393,821	1,021,273