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, 2017		$ 118,105	$ 86,782	$ 31,117	$ 206
Beginning Balance (in shares) at Dec. 31, 2017			10,615
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		5,230		5,230
Other comprehensive income (loss), net of tax		(166)			(166)
Dividends on common stock		(619)	$ 25	(644)
Common stock issued and related tax effects	[1]	554	$ 554
Common stock issued and related tax effects (in shares)	[1]		94
Ending Balance at Mar. 31, 2018		123,104	$ 87,361	35,713	30
Ending Balance (in shares) at Mar. 31, 2018			10,709
Beginning Balance at Dec. 31, 2017		118,105	$ 86,782	31,117	206
Beginning Balance (in shares) at Dec. 31, 2017			10,615
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		10,627
Other comprehensive income (loss), net of tax		(171)
Ending Balance at Jun. 30, 2018		128,141	$ 87,755	40,386
Ending Balance (in shares) at Jun. 30, 2018			10,731
Beginning Balance at Mar. 31, 2018		123,104	$ 87,361	35,713	30
Beginning Balance (in shares) at Mar. 31, 2018			10,709
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		5,397		5,397
Other comprehensive income (loss), net of tax		(5)			(5)
Dividends on common stock		(721)	$ 28	(749)
Common stock issued and related tax effects	[1]	366	$ 366
Common stock issued and related tax effects (in shares)	[1]		22
Ending Balance at Jun. 30, 2018		128,141	$ 87,755	40,386
Ending Balance (in shares) at Jun. 30, 2018			10,731
Beginning Balance at Dec. 31, 2018		$ 138,488	$ 88,484	50,161	(157)
Beginning Balance (in shares) at Dec. 31, 2018		10,780	10,780
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 5,740		5,740
Other comprehensive income (loss), net of tax		(50)			(50)
Dividends on common stock		(730)	$ 26	(756)
Common stock issued and related tax effects	[1]	269	$ 269
Common stock issued and related tax effects (in shares)	[1]		42
Ending Balance at Mar. 31, 2019		143,717	$ 88,779	55,145	(207)
Ending Balance (in shares) at Mar. 31, 2019			10,822
Beginning Balance at Dec. 31, 2018		$ 138,488	$ 88,484	50,161	(157)
Beginning Balance (in shares) at Dec. 31, 2018		10,780	10,780
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 11,574
Other comprehensive income (loss), net of tax		104
Ending Balance at Jun. 30, 2019		$ 149,383	$ 89,327	60,109	(53)
Ending Balance (in shares) at Jun. 30, 2019		10,856	10,856
Beginning Balance at Mar. 31, 2019		$ 143,717	$ 88,779	55,145	(207)
Beginning Balance (in shares) at Mar. 31, 2019			10,822
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		5,834		5,834
Other comprehensive income (loss), net of tax		154			154
Dividends on common stock		(839)	$ 31	(870)
Common stock issued and related tax effects	[1]	517	$ 517
Common stock issued and related tax effects (in shares)	[1]		34
Ending Balance at Jun. 30, 2019		$ 149,383	$ 89,327	$ 60,109	$ (53)
Ending Balance (in shares) at Jun. 30, 2019		10,856	10,856

[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