Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net
Beginning balance, shares at Dec. 31, 2013		16,211,000
Beginning balance at Dec. 31, 2013	$ 215,762	$ 138,659	$ 78,265	$ (1,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted and unrestricted stock awards issued, net of forfeitures, shares		124,000
Restricted and unrestricted stock awards issued, net of forfeitures	0
Stock option compensation expense	$ 20	$ 20
Exercise of stock options (including excess tax benefits from nonqualified stock options), shares	70,854	71,000
Exercise of stock options (including excess tax benefits from nonqualified stock options)	$ 766	$ 766
Restricted stock compensation expense	896	896
Excess tax benefits from restricted stock	60	$ 60
Common stock repurchased, shares		(127,000)
Common stock repurchased	(2,119)	$ (2,119)
Net income	13,759		13,759
Other comprehensive income (loss), net of tax	1,108			1,108
Common stock issued in business combination, shares		13,973,000
Common stock issued in business combination	226,724	$ 226,724
Cash dividends declared on common stock	(5,325)		(5,325)
Ending balance, shares at Sep. 30, 2014		30,252,000
Ending balance at Sep. 30, 2014	451,651	$ 365,006	86,699	(54)
Beginning balance, shares at Dec. 31, 2014		30,260,000
Beginning balance at Dec. 31, 2014	454,506	$ 364,741	86,387	3,378
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted and unrestricted stock awards issued, net of forfeitures, shares		118,000
Restricted and unrestricted stock awards issued, net of forfeitures	$ 0
Exercise of stock options (including excess tax benefits from nonqualified stock options), shares	53,198	53,000
Exercise of stock options (including excess tax benefits from nonqualified stock options)	$ 686	$ 686
Restricted stock compensation expense	1,125	1,125
Excess tax benefits from restricted stock	105	$ 105
Common stock repurchased, shares		(464,000)
Common stock repurchased	(7,730)	$ (7,730)
Net income	27,996		27,996
Other comprehensive income (loss), net of tax	1,629			1,629
Common stock issued in business combination	0
Cash dividends declared on common stock	(9,621)		(9,621)
Ending balance, shares at Sep. 30, 2015		29,967,000
Ending balance at Sep. 30, 2015	$ 468,696	$ 358,927	$ 104,762	$ 5,007