Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Dividends per share	$ 0.11
Beginning balance at Dec. 31, 2013	$ 265,926	$ 511	$ 94,474	$ 182,935	$ (11,994)
Common Stock, Shares, Outstanding at Dec. 31, 2013		14,799,991
Stockholders' Equity Attributable to Parent [Abstract]
Net income	22,259	$ 0	0	22,259	0
Dividends	(1,628)	0	0	(1,628)	0
Share-based compensation expense	1,767	0	1,767	0	0
Common stock issued	374	0	374	0	0
Other comprehensive loss	13,540	0	0	0	13,540
Ending balance at Dec. 31, 2014	$ 302,238	$ 511	96,615	203,566	1,546
Common Stock, Shares, Outstanding at Dec. 31, 2014		14,856,611
Number of Shares [Abstract]
Common stock issued, shares		56,620
Dividends per share	$ 0.00
Net income	$ 41,319	$ 0	0	41,319	0
Share-based compensation expense	1,267	0	1,267	0	0
Common stock issued	124,446	0	124,446	0	0
Other comprehensive loss	(3,995)	0	0	0	(3,995)
Ending balance at Dec. 31, 2015	$ 465,275	$ 511	222,328	244,885	(2,449)
Common Stock, Shares, Outstanding at Dec. 31, 2015	22,076,534	22,076,534
Number of Shares [Abstract]
Common stock issued, shares		7,219,923
Dividends per share	$ 0.00
Net income	$ 58,151	$ 0	0	58,151	0
Share-based compensation expense	1,788	0	1,788	0	0
Common stock issued	112,033	0	112,033	0	0
Other comprehensive loss	(7,963)	0	0	0	(7,963)
Ending balance at Dec. 31, 2016	$ 629,284	$ 511	$ 336,149	$ 303,036	$ (10,412)
Common Stock, Shares, Outstanding at Dec. 31, 2016	26,800,183	26,800,183
Number of Shares [Abstract]
Common stock issued, shares		4,723,649