Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Accumulated Other Comprehensive Income Member	Treasury Stock Member
Balance, shares at Dec. 31, 2019		3,566,146
Balance, Beg at Dec. 31, 2019	$ 98,328	$ 39	$ 3,784	$ 101,801	$ 2,059	$ (9,355)
Net earnings	5,398	0	0	5,398	0	0
Other Comprehensive Income (Loss), Net Of Tax	5,310	0	0	0	5,310	0
Cash dividends paid	2,728	0	0	2,728	0	0
Sale of treasury stock	6	$ 0	5	0	0	1
Treasury shares sold		130
Balance, End at Sep. 30, 2020	106,314	$ 39	3,789	104,471	7,369	(9,354)
Balance, shares at Sep. 30, 2020		3,566,276
Balance, shares at Jun. 30, 2020		3,566,176
Balance, Beg at Jun. 30, 2020	105,299	$ 39	3,785	103,444	7,386	(9,355)
Net earnings	1,936	0	0	1,936	0	0
Other Comprehensive Income (Loss), Net Of Tax	(17)	0	0	0	(17)	0
Cash dividends paid	909	0	0	909	0	0
Sale of treasury stock	5	$ 0	4	0	0	1
Treasury shares sold		100
Balance, End at Sep. 30, 2020	106,314	$ 39	3,789	104,471	7,369	(9,354)
Balance, shares at Sep. 30, 2020		3,566,276
Balance, shares at Dec. 31, 2020		3,566,276
Balance, Beg at Dec. 31, 2020	107,690	$ 39	3,789	105,617	7,599	(9,354)
Net earnings	6,167	0	0	6,167	0	0
Other Comprehensive Income (Loss), Net Of Tax	(4,848)	0	0	0	(4,848)	0
Cash dividends paid	2,766	0	0	2,766	0	0
Treasury Stock, acquired	(1,320)	$ 0	0	0	0	(1,320)
Treasury Stock, acquired shares		37,093
Sale of treasury stock	6	$ 0	5	0	0	1
Treasury shares sold		155
Balance, End at Sep. 30, 2021	104,929	$ 39	3,794	109,018	2,751	(10,673)
Balance, shares at Sep. 30, 2021		3,529,338
Balance, shares at Jun. 30, 2021		3,545,855
Balance, Beg at Jun. 30, 2021	106,043	$ 39	3,792	108,060	4,255	(10,103)
Net earnings	1,875	0	0	1,875	0	0
Other Comprehensive Income (Loss), Net Of Tax	(1,504)	0	0	0	(1,504)	0
Cash dividends paid	917	0	0	917	0	0
Treasury Stock, acquired	(570)	$ 0	0	0	0	(570)
Treasury Stock, acquired shares		16,582
Sale of treasury stock	2	$ 0	2	0	0	0
Treasury shares sold		65
Balance, End at Sep. 30, 2021	$ 104,929	$ 39	$ 3,794	$ 109,018	$ 2,751	$ (10,673)
Balance, shares at Sep. 30, 2021		3,529,338