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			4,531			4,531
Net other comprehensive income (loss)				3,547		3,547
Purchase of treasury stock					(1,279)	(1,279)
Restricted stock, executive and Board of Director awards		1			12	13
Restricted stock vesting		40				40
Cash dividend reinvestment paid from treasury stock		(1)	0		255	254
Cash dividends			(1,957)			(1,957)
Balance at Mar. 31, 2020	$ 3,939	55,129	113,374	2,918	(15,437)	159,923
Balance (in shares) at Mar. 31, 2020	3,938,668
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			8,463			8,463
Net other comprehensive income (loss)				(1,585)		(1,585)
Purchase of treasury stock					(513)	(513)
Restricted stock, executive and Board of Director awards		(2)				(2)
Restricted stock vesting		5				5
Forfeited restricted stock		(3)			3	0
Cash dividends			(1,820)			(1,820)
Balance at Mar. 31, 2021	$ 4,350	$ 75,908	$ 133,270	$ 1,002	$ (15,723)	$ 198,807
Balance (in shares) at Mar. 31, 2021	4,350,342