CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2019	$ 3,939	$ 55,089	$ 110,800	$ (629)	$ (14,425)	$ 154,774
Balance (in shares) at Dec. 31, 2019	3,938,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			17,876			17,876
Net other comprehensive income (loss)				3,494		3,494
Stock dividend	$ 38	1,878				0
Stock dividend			(1,916)
Stock dividend (in shares)	38,318
Issuance of Common stock	$ 373	18,854				19,227
Issuance of Common stock (in shares)	373,356
Purchase of treasury stock					(2,120)	(2,120)
Restricted stock, executive and Board of Director awards		(236)			491	255
Restricted stock vesting		281				281
Cash dividend reinvestment paid from treasury stock		1	0		820	821
Cash dividends			(5,557)			(5,557)
Balance at Sep. 30, 2020	$ 4,350	75,867	121,203	2,865	(15,234)	189,051
Balance (in shares) at Sep. 30, 2020	4,350,342
Balance at Jun. 30, 2020	$ 4,350	75,863	115,000	2,907	(15,025)	183,095
Balance (in shares) at Jun. 30, 2020	4,350,342
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			8,007			8,007
Net other comprehensive income (loss)				(42)		(42)
Purchase of treasury stock					(618)	(618)
Restricted stock, executive and Board of Director awards		(3)			153	150
Cash dividend reinvestment paid from treasury stock		7	0		256	263
Cash dividends			(1,804)			(1,804)
Balance at Sep. 30, 2020	$ 4,350	75,867	121,203	2,865	(15,234)	189,051
Balance (in shares) at Sep. 30, 2020	4,350,342
Balance at Dec. 31, 2020	$ 4,350	75,908	126,627	2,587	(15,213)	194,259
Balance (in shares) at Dec. 31, 2020	4,350,342
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			22,174			22,174
Net other comprehensive income (loss)				(1,618)		(1,618)
Stock dividend	$ 39	2,313				0
Stock dividend			(2,352)
Stock dividend (in shares)	38,559
Purchase of treasury stock					(894)	(894)
Restricted stock, executive and Board of Director awards		(257)			429	172
Restricted stock vesting		403				403
Forfeited restricted stock		3			(3)	0
Cash dividends			(5,529)			(5,529)
Balance at Sep. 30, 2021	$ 4,389	78,370	140,920	969	(15,681)	208,967
Balance (in shares) at Sep. 30, 2021	4,388,901
Balance at Jun. 30, 2021	$ 4,389	78,412	135,714	1,610	(15,706)	204,419
Balance (in shares) at Jun. 30, 2021	4,388,901
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			7,064			7,064
Net other comprehensive income (loss)				(641)		(641)
Purchase of treasury stock					(45)	(45)
Restricted stock, executive and Board of Director awards		(42)			70	28
Cash dividends			(1,858)			(1,858)
Balance at Sep. 30, 2021	$ 4,389	$ 78,370	$ 140,920	$ 969	$ (15,681)	$ 208,967
Balance (in shares) at Sep. 30, 2021	4,388,901