Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands		Total	Common stock	Retained earnings	[1]	Accumulated other comprehensive income (loss)
Beginning Balance (in shares) at Dec. 31, 2016			10,477,000
Beginning balance at Dec. 31, 2016		$ 106,291	$ 85,383	$ 20,748		$ 160
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		12,893		12,893
Other comprehensive loss, net of tax		46				46
Dividends on common stock		(2,380)	$ 144	(2,524)
Common stock issued and related tax effects (in shares)	[2]		138,000
Common stock issued and related tax effects	[2]	1,255	$ 1,255
Ending Balance (in shares) at Dec. 31, 2017			10,615,000
Ending balance at Dec. 31, 2017		118,105	$ 86,782	31,117		206
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		21,919		21,919
Other comprehensive loss, net of tax		(328)				(328)
Dividends on common stock		(2,802)	$ 107	(2,910)
Common stock issued and related tax effects (in shares)	[2]		165,000
Common stock issued and related tax effects	[2]	$ 1,595	$ 1,595
Ending Balance (in shares) at Dec. 31, 2018		10,780,000	10,780,000
Ending balance at Dec. 31, 2018		$ 138,488	$ 88,484	50,161		(157)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		23,653		23,653
Other comprehensive loss, net of tax		311				311
Dividends on common stock		(3,255)	$ 117	(3,372)
Common stock issued and related tax effects (in shares)	[2]		101,000
Common stock issued and related tax effects	[2]	$ 1,512	$ 1,512
Ending Balance (in shares) at Dec. 31, 2019		10,881,000	10,881,000
Ending balance at Dec. 31, 2019		$ 160,709	$ 90,113	$ 70,442		$ 154
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings impact due to adoption of ASU | Accounting Standards Update 2016-01		$ 40

[1] (2) 2017 includes the impact of implementing ASU 2016-09, “Compensation - Stock Compensation (Topic 718),” which resulted in a cumulative-effect adjustment of $498 thousand to retained earnings.

[2] (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.