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, 2016	$ 27,155	$ 52,095	$ 1,381	$ 80,631
Balance, shares at Dec. 31, 2016	2,453,805
Net income		8,716		8,716
Other comprehensive income (loss)			126	126
Effect of adopting ASU		(297)	297
Issuance of common stock through Employee Stock Purchase Plan	$ 126			126
Issuance of common stock through Employee Stock Purchase Plan, shares	4,085
Issuance of common stock through Dividend Reinvestment Plan	$ 331			331
Issuance of common stock through Dividend Reinvestment Plan, shares	7,744
Issuance of common stock from vested restricted share grants through stock compensation plans, shares	9,657
Issuance of common stock through exercise of stock options and SSARs	$ 416			416
Issuance of common stock through exercise of stock options and SSARs, shares	16,000
Stock-based compensation expense	$ 333			333
Issuance of common stock from stock split	1,243,187
Cash in lieu of fractional shares paid due to the stock split		(11)		(11)
Cash dividends declared		(3,285)		(3,285)
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)
Effect of adopting ASU		421	(421)
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 options and SSARs	$ 14			14
Issuance of common stock through exercise of stock options and SSARs, shares	2,685
Stock-based compensation expense	$ 880			880
Cash dividends declared		(3,708)		(3,708)
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
Effect of adopting ASU		(91)		(91)
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 options and SSARs, shares	1,965
Stock-based compensation expense	$ 958			958
Cash dividends declared		(4,037)		(4,037)
Balance at Dec. 31, 2019	$ 30,848	$ 72,385	$ 3,602	$ 106,835
Balance, shares at Dec. 31, 2019	3,781,500