CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Income
Balance at Dec. 31, 2015	$ 298,980	$ 215	$ 221,487	$ 76,946	$ 332
Balance (in shares) at Dec. 31, 2015		21,570,746
Increase (Decrease) in Stockholders' Equity
Net income	8,554			8,554
Other comprehensive income	1,129				1,129
Share-based compensation expense	461		461
Issuance of restricted stock (in shares)		118,936
Common stock issued	119,383	$ 58	119,325
Common stock issued (in shares)		5,815,051
Exercise of stock options	387		387
Exercise of stock options (in shares)		32,500
Balance at Mar. 31, 2016	428,894	$ 273	341,660	85,500	1,461
Balance (in shares) at Mar. 31, 2016		27,537,233
Balance at Dec. 31, 2016	$ 459,740	$ 274	345,138	117,049	(2,721)
Balance (in shares) at Dec. 31, 2016	27,798,283	27,798,283
Increase (Decrease) in Stockholders' Equity
Net income	$ 9,521			9,521
Other comprehensive income	1,013				1,013
Share-based compensation expense	1,154		1,154
Issuance of restricted stock (in shares)		56,866
Repurchase of common stock	(904)		(904)
Repurchase of common stock (in shares)		0
Exercise of stock options	501	$ 1	500
Exercise of stock options (in shares)		53,667
Balance at Mar. 31, 2017	$ 471,025	$ 275	$ 345,888	$ 126,570	$ (1,708)
Balance (in shares) at Mar. 31, 2017	27,908,816	27,908,816