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, 2016		$ 106,291	$ 85,383	$ 20,748		$ 160
Beginning Balance (in shares) at Dec. 31, 2016			10,477
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		10,393		10,393
Other comprehensive income (loss), net of tax		(29)				(29)
Dividends on common stock		(1,766)	$ 115	(1,881)
Common stock issued and related tax effects	[1]	925	$ 925
Common stock issued and related tax effects (in shares)	[1]		109
Ending Balance at Sep. 30, 2017		115,814	$ 86,423	29,260		131
Ending Balance (in shares) at Sep. 30, 2017			10,586
Beginning Balance at Jun. 30, 2017						198
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		3,757
Other comprehensive income (loss), net of tax		(67)
Ending Balance at Sep. 30, 2017		115,814	$ 86,423	29,260		131
Ending Balance (in shares) at Sep. 30, 2017			10,586
Beginning Balance at Dec. 31, 2017		$ 118,105	$ 86,782	31,117		206
Beginning Balance (in shares) at Dec. 31, 2017		10,615	10,615
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 16,117		16,117
Other comprehensive income (loss), net of tax		(374)				(374)
Dividends on common stock		(2,067)	$ 81	(2,148)
Common stock issued and related tax effects	[1]	1,286	$ 1,286
Common stock issued and related tax effects (in shares)	[1]		141
Ending Balance at Sep. 30, 2018		$ 133,067	$ 88,149	45,121		(203)
Ending Balance (in shares) at Sep. 30, 2018		10,756	10,756
Beginning Balance at Jun. 30, 2018						35
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 5,490
Other comprehensive income (loss), net of tax		(203)
Ending Balance at Sep. 30, 2018		$ 133,067	$ 88,149	45,121		(203)
Ending Balance (in shares) at Sep. 30, 2018		10,756	10,756
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of new accounting principle in period of adoption | ASU 2016-01		$ 40		(40)	[2]	40	[2]
Cumulative effect of new accounting principle in period of adoption | ASU 2018-02		$ 75		$ 75	[3]	$ (75)	[3]

[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

[2] As a result of ASU 2016-01, "Financial Instruments Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities", the Company reclassed $40 thousand of gains (losses) on available for sale equity securities sitting in accumulated other comprehensive income to retained earnings.

[3] As a result of ASU 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income", the Company reclassed $75 thousand from accumulated other comprehensive income to retained earnings.