Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Total	Common stock	Retained earnings	Accumulated other comprehensive (loss)
Beginning Balance at Dec. 31, 2015		$ 78,470	$ 59,371	$ 19,566	$ (467)
Beginning Balance (in shares) at Dec. 31, 2015			9,279
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		7,029		7,029
Other comprehensive income, net of tax		(326)			(326)
Dividends on common stock		(631)	$ 48	(679)
Common stock issued and related tax effects	[1]	425	$ 425
Common stock issued and related tax effects (in shares)	[1]		57
Ending Balance at Jun. 30, 2016		84,967	$ 59,844	25,916	(793)
Ending Balance (in shares) at Jun. 30, 2016			9,336
Beginning Balance at Mar. 31, 2016					(701)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		2,824
Other comprehensive income, net of tax		(92)
Ending Balance at Jun. 30, 2016		84,967	$ 59,844	25,916	(793)
Ending Balance (in shares) at Jun. 30, 2016			9,336
Beginning Balance at Dec. 31, 2016		$ 106,291	$ 85,383	20,748	160
Beginning Balance (in shares) at Dec. 31, 2016		10,477	10,477
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 6,636		6,636
Other comprehensive income, net of tax		38			38
Dividends on common stock		(1,173)	$ 74	(1,247)
Common stock issued and related tax effects	[1]	655	$ 655
Common stock issued and related tax effects (in shares)	[1]		90
Ending Balance at Jun. 30, 2017		$ 112,447	$ 86,112	26,137	198
Ending Balance (in shares) at Jun. 30, 2017		10,567	10,567
Beginning Balance at Mar. 31, 2017					134
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 3,444
Other comprehensive income, net of tax		64
Ending Balance at Jun. 30, 2017		$ 112,447	$ 86,112	$ 26,137	$ 198
Ending Balance (in shares) at Jun. 30, 2017		10,567	10,567

[1] Includes the issuance of common stock under employee benefit plans, which includes nonqualified stock options and restricted stock expense related entries, employee option exercises and the tax benefit of options exercised