Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 9,076	$ 8,126	$ 30,132	$ 26,484
Weighted average shares outstanding-basic (shares)	46,604,051	45,492,713	46,192,273	45,257,199
Effect of non-vested restricted stock and stock options outstanding (shares)	690,594	1,248,510	945,134	1,577,148
Weighted average shares outstanding-diluted (shares)	47,294,645	46,741,223	47,137,407	46,834,347
Earnings per share-basic (usd per share)	$ 0.19	$ 0.18	$ 0.65	$ 0.59
Earnings per share-diluted (usd per share)	$ 0.19	$ 0.17	$ 0.64	$ 0.57
Anti-dilutive shares (shares)	190,444	1,091,464	645,011	393,821