Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Stock	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Total
Beginning Balance at Dec. 31, 2018		$ 88,484	$ 50,161	$ (157)		$ 138,488
Beginning Balance (in shares) at Dec. 31, 2018		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		$ 26	(756)			(730)
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		$ 88,779	55,145	(207)		143,717
Ending Balance (in shares) at Mar. 31, 2019		10,822
Beginning Balance at Dec. 31, 2018		$ 88,484	50,161	(157)		138,488
Beginning Balance (in shares) at Dec. 31, 2018		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		$ 89,327	60,109	(53)		149,383
Ending Balance (in shares) at Jun. 30, 2019		10,856
Beginning Balance at Mar. 31, 2019		$ 88,779	55,145	(207)		143,717
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		$ 31	(870)			(839)
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		$ 89,327	60,109	(53)		149,383
Ending Balance (in shares) at Jun. 30, 2019		10,856
Beginning Balance at Dec. 31, 2019		$ 90,113	70,442	154	$ 0	$ 160,709
Beginning Balance (in shares) at Dec. 31, 2019		10,881				10,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			5,368			$ 5,368
Other comprehensive income (loss), net of tax				(986)		(986)
Dividends on common stock		$ 30	(871)			(841)
Common stock issued and related tax effects	[1]	$ 227				227
Common stock issued and related tax effects (in shares)	[1]	13
Acquisition of treasury stock, at cost					(172)	(172)
Acquisition of treasury stock, at cost (in shares)		(11)
Ending Balance at Mar. 31, 2020		$ 90,370	74,939	(832)	(172)	164,305
Ending Balance (in shares) at Mar. 31, 2020		10,883
Beginning Balance at Dec. 31, 2019		$ 90,113	70,442	154	0	$ 160,709
Beginning Balance (in shares) at Dec. 31, 2019		10,881				10,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						$ 10,539
Other comprehensive income (loss), net of tax						(912)
Ending Balance at Jun. 30, 2020		$ 91,103	79,253	(758)	(2,991)	$ 166,607
Ending Balance (in shares) at Jun. 30, 2020		10,728				10,728
Beginning Balance at Mar. 31, 2020		$ 90,370	74,939	(832)	(172)	$ 164,305
Beginning Balance (in shares) at Mar. 31, 2020		10,883
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			5,171			5,171
Other comprehensive income (loss), net of tax				74		74
Dividends on common stock		$ 29	(857)			(828)
Common stock issued and related tax effects	[1]	$ 704				704
Common stock issued and related tax effects (in shares)	[1]	45
Acquisition of treasury stock, at cost					(2,819)	(2,819)
Acquisition of treasury stock, at cost (in shares)		(200)
Ending Balance at Jun. 30, 2020		$ 91,103	$ 79,253	$ (758)	$ (2,991)	$ 166,607
Ending Balance (in shares) at Jun. 30, 2020		10,728				10,728

[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.