Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 10,121	$ 13,139	$ 8,204	$ 8,771	$ 9,946	$ 9,076	$ 10,612	$ 10,445	$ 40,235	$ 40,079	$ 24,768
Weighted average shares outstanding-basic (in shares)									46,783,442	46,319,760	45,325,445
Effect of non-vested restricted stock and stock options outstanding (in shares)									380,362	787,673	1,550,285
Weighted average shares outstanding-diluted (in shares)									47,163,804	47,107,433	46,875,730
Earnings per share-basic (dollars per share)	$ 0.22	$ 0.28	$ 0.18	$ 0.19	$ 0.21	$ 0.19	$ 0.23	$ 0.23	$ 0.86	$ 0.87	$ 0.55
Earnings per share-diluted (dollars per share)	$ 0.21	$ 0.28	$ 0.17	$ 0.19	$ 0.21	$ 0.19	$ 0.23	$ 0.22	$ 0.85	$ 0.85	$ 0.53
Anti-dilutive shares (in shares)									546,120	765,792	334,927