CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2018	$ 221	$ 148,763	$ (10,244)	$ (1,279)	$ 137,461
Beginning Balance, shares at Dec. 31, 2018	22,132
Issuance of common stock		107			107
Issuance of common stock, shares	14
Exercise and issuance of employee stock options	$ 2	882			884
Exercise and issuance of employee stock options, shares	112
Net income			7,047		7,047
Dividends paid on common stock			(1,332)		(1,332)
Other comprehensive income (loss)				3,229	3,229
Ending Balance at Jun. 30, 2019	$ 223	149,752	(4,529)	1,950	147,396
Ending Balance, shares at Jun. 30, 2019	22,258
Beginning Balance at Mar. 31, 2019	$ 222	149,115	(7,406)	377	142,308
Beginning Balance, shares at Mar. 31, 2019	22,169
Issuance of common stock		53			53
Issuance of common stock, shares	8
Exercise and issuance of employee stock options	$ 1	584			585
Exercise and issuance of employee stock options, shares	81
Net income			3,544		3,544
Dividends paid on common stock			(667)		(667)
Other comprehensive income (loss)				1,573	1,573
Ending Balance at Jun. 30, 2019	$ 223	149,752	(4,529)	1,950	147,396
Ending Balance, shares at Jun. 30, 2019	22,258
Beginning Balance at Dec. 31, 2019	$ 224	150,728	2,562	1,965	155,479
Beginning Balance, shares at Dec. 31, 2019	22,423
Issuance of common stock		103			103
Issuance of common stock, shares	15
Exercise and issuance of employee stock options		474			474
Exercise and issuance of employee stock options, shares	4
Stock purchased under stock repurchase plan	$ (1)	(877)			(878)
Stock purchased under stock repurchase plan, Shares	(131)
Net income			5,575		5,575
Dividends paid on common stock			(2,237)		(2,237)
Other comprehensive income (loss)				2,265	2,265
Ending Balance at Jun. 30, 2020	$ 223	150,428	5,900	4,230	160,781
Ending Balance, shares at Jun. 30, 2020	22,311
Beginning Balance at Mar. 31, 2020	$ 223	150,219	2,856	2,170	155,468
Beginning Balance, shares at Mar. 31, 2020	22,317
Issuance of common stock		49			49
Issuance of common stock, shares	9
Exercise and issuance of employee stock options		232			232
Stock purchased under stock repurchase plan		(72)			(72)
Stock purchased under stock repurchase plan, Shares	(15)
Net income			4,160		4,160
Dividends paid on common stock			(1,116)		(1,116)
Other comprehensive income (loss)				2,060	2,060
Ending Balance at Jun. 30, 2020	$ 223	$ 150,428	$ 5,900	$ 4,230	$ 160,781
Ending Balance, shares at Jun. 30, 2020	22,311