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	18,923			18,923
Other comprehensive income	1,768				1,768
Share-based compensation expense	1,048		1,048
Issuance of restricted stock, net (in shares)		218,236
Common stock issued	119,383	$ 58	119,325
Common stock issued (in shares)		5,815,051
Exercise of stock options	528		528
Exercise of stock options (in shares)		46,500
Balance at Jun. 30, 2016	440,630	$ 273	342,388	95,869	2,100
Balance (in shares) at Jun. 30, 2016		27,650,533
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	$ 23,697			23,697
Other comprehensive income	5,981				5,981
Share-based compensation expense	2,797		2,797
Issuance of restricted stock, net	0		0
Issuance of restricted stock, net (in shares)		53,468
Common stock issued	464,982	$ 120	464,862
Common stock issued (in shares)		11,959,022
Repurchase of common stock	(1,077)		(1,077)
Repurchase of common stock (in shares)		0
Exercise of stock options	3,611	$ 2	3,609
Exercise of stock options (in shares)		237,985
Balance at Jun. 30, 2017	$ 959,731	$ 396	$ 815,329	$ 140,746	$ 3,260
Balance (in shares) at Jun. 30, 2017	40,048,758	40,048,758