CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance (in shares) at Dec. 31, 2015		12,814,696
Balance at Dec. 31, 2015	$ 258,490	$ 12,815	$ 209,285	$ 34,411	$ 2,017	$ (38)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	17,080			17,080
Other comprehensive income	3,333				3,333
Common stock issued in connection with the exercise of stock options and restricted stock awards (in shares)		90,372
Common stock issued in connection with the exercise of stock options and restricted stock awards	1,076	$ 90	986
Repurchase of treasury stock	38					38
Stock based compensation expense	1,078		1,078
Balance (in shares) at Sep. 30, 2016		12,905,068
Balance at Sep. 30, 2016	281,095	$ 12,905	211,349	51,491	5,350	0
Balance (in shares) at Dec. 31, 2016		12,958,341
Balance at Dec. 31, 2016	279,817	$ 12,958	212,649	57,262	(3,052)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,428			14,428
Other comprehensive income	3,975				3,975
Common stock issued in connection with the exercise of stock options and restricted stock awards (in shares)		212,388
Common stock issued in connection with the exercise of stock options and restricted stock awards	3,213	$ 213	3,000
Stock based compensation expense	1,294		1,294
Balance (in shares) at Sep. 30, 2017		13,170,729
Balance at Sep. 30, 2017	$ 302,727	$ 13,171	$ 216,943	$ 71,690	$ 923	$ 0