Consolidated Statement of Changes in Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2017	$ 3,870,000	$ 51,108,000	$ 89,982,000	$ (3,398,000)	$ (12,551,000)	$ 129,011,000	$ (1,000)	$ 1,000	$ 0
Balance (in shares) at Dec. 31, 2017	3,869,939
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			18,034,000			18,034,000
Other comprehensive income (loss)				(524,000)		(524,000)
Stock dividend	$ 34,000	2,108,000
Stock dividend			(2,142,000)			0
Stock dividend (in shares)	34,272
Issuance of Common stock						0
Issuance of Common stock (in shares)	1
Purchase of treasury stock					(1,175,000)	(1,175,000)
Restricted stock, executive, Board of Director awards		(364,000)			116,000	(248,000)
Restricted stock vesting		247,000				247,000
Cash dividend reinvestment paid from treasury stock			(30,000)		30,000	0
Cash dividends			(6,116,000)			(6,116,000)
Balance at Dec. 31, 2018	$ 3,904,000	53,099,000	99,727,000	(3,921,000)	(13,580,000)	139,229,000
Balance (in shares) at Dec. 31, 2018	3,904,212
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			19,490,000			19,490,000
Other comprehensive income (loss)				3,292,000		3,292,000
Stock dividend	$ 35,000	2,067,000
Stock dividend			(2,102,000)			0
Stock dividend (in shares)	34,456
Purchase of treasury stock					(1,291,000)	(1,291,000)
Restricted stock, executive, Board of Director awards		(374,000)			489,000	115,000
Restricted stock vesting		254,000				254,000
Forfeited restricted stock		43,000			(43,000)	0
Cash dividends			(6,315,000)			(6,315,000)
Balance at Dec. 31, 2019	$ 3,939,000	55,089,000	110,800,000	(629,000)	(14,425,000)	154,774,000
Balance (in shares) at Dec. 31, 2019	3,938,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			25,103,000			25,103,000
Other comprehensive income (loss)				3,216,000		3,216,000
Stock dividend	$ 38,000	1,878,000
Stock dividend			(1,916,000)			0
Stock dividend (in shares)	38,318
Stock issued for acquisition	$ 373,000	18,854,000				19,227,000
Stock issued for acquisition (in shares)	373,356
Purchase of treasury stock					(2,122,000)	(2,122,000)
Restricted stock, executive, Board of Director awards		(260,000)			408,000	148,000
Restricted stock vesting		326,000				326,000
Sale of treasury stock		1,000			125,000	126,000
Forfeited restricted stock		19,000			(19,000)	0
Cash dividend reinvestment paid from treasury stock		1,000	(821,000)		820,000	0
Cash dividends			(6,539,000)			(6,539,000)
Balance at Dec. 31, 2020	$ 4,350,000	$ 75,908,000	$ 126,627,000	$ 2,587,000	$ (15,213,000)	$ 194,259,000
Balance (in shares) at Dec. 31, 2020	4,350,342