Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Capital Stock [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss) [Member]	Total
Balance at Dec. 31, 2017	$ 28,361	$ 57,218	$ 1,804	$ 87,383
Balance, shares at Dec. 31, 2017	3,734,478
Net income		11,006		11,006
Other comprehensive income (loss)			(2,478)	(2,478)
Issuance of common stock through Employee Stock Purchase Plan	$ 149			149
Issuance of common stock through Employee Stock Purchase Plan, shares	6,783
Issuance of common stock through Dividend Reinvestment Plan	$ 311			311
Issuance of common stock through Dividend Reinvestment Plan, shares	5,486
Issuance of common stock from vested restricted share grants through stock compensation plans, shares	9,994
Issuance of common stock through exercise of stock optins and SSARs	$ 14			14
Issuance of common stock through exercise of stock optins and SSARs, shares	2,685
Stock-based compensation expense	$ 880			880
Cash dividends declared		(3,708)		(3,708)
Balance (ASU 2016-01 [Member]) at Dec. 31, 2018		421	(421)
Balance at Dec. 31, 2018	$ 29,715	64,937	(1,095)	93,557
Balance, shares at Dec. 31, 2018	3,759,426
Net income		11,576		11,576
Other comprehensive income (loss)			4,697	4,697
Issuance of common stock through Employee Stock Purchase Plan	$ 175			175
Issuance of common stock through Employee Stock Purchase Plan, shares	4,535
Issuance of common stock from vested restricted share grants through stock compensation plans, shares	15,574
Issuance of common stock through exercise of stock optins and SSARs, shares	1,965
Stock-based compensation expense	$ 958			958
Cash dividends declared		(4,037)		(4,037)
Balance (ASU 2016-02 [Member]) at Dec. 31, 2019		(91)		(91)
Balance at Dec. 31, 2019	$ 30,848	72,385	3,602	106,835
Balance, shares at Dec. 31, 2019	3,781,500
Net income		13,035		13,035
Other comprehensive income (loss)			5,350	5,350
Issuance of common stock through Employee Stock Purchase Plan	$ 219			219
Issuance of common stock through Employee Stock Purchase Plan, shares	3,885
Issuance of common stock from vested restricted share grants through stock compensation plans, shares	15,395
Stock-based compensation expense	$ 1,201			1,201
Issuance of common stock for acquisition	$ 45,408			45,408
Issuance of common stock for acquisition, shares	1,176,970
Cash dividends declared		(5,378)		(5,378)
Balance at Dec. 31, 2020	$ 77,676	$ 80,042	$ 8,952	$ 166,670
Balance, shares at Dec. 31, 2020	4,977,750