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		161			161
Issuance of common stock, shares	21
Exercise and issuance of employee stock options	$ 2	1,340			1,342
Exercise and issuance of employee stock options, shares	182
Net income			11,660		11,660
Dividends paid on common stock			(2,002)		(2,002)
Other comprehensive income (loss)				4,016	4,016
Ending Balance at Sep. 30, 2019	$ 223	150,264	(586)	2,737	152,638
Ending Balance, shares at Sep. 30, 2019	22,335
Beginning Balance at Jun. 30, 2019	$ 223	149,752	(4,529)	1,950	147,396
Beginning Balance, shares at Jun. 30, 2019	22,258
Issuance of common stock		54			54
Issuance of common stock, shares	7
Exercise and issuance of employee stock options		458			458
Exercise and issuance of employee stock options, shares	70
Net income			4,613		4,613
Dividends paid on common stock			(670)		(670)
Other comprehensive income (loss)				787	787
Ending Balance at Sep. 30, 2019	$ 223	150,264	(586)	2,737	152,638
Ending Balance, shares at Sep. 30, 2019	22,335
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		152			152
Issuance of common stock, shares	25
Exercise and issuance of employee stock options		705			705
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			10,091		10,091
Dividends paid on common stock			(3,353)		(3,353)
Other comprehensive income (loss)				3,594	3,594
Ending Balance at Sep. 30, 2020	$ 223	150,708	9,300	5,559	165,790
Ending Balance, shares at Sep. 30, 2020	22,321
Beginning Balance at Jun. 30, 2020	$ 223	150,428	5,900	4,230	160,781
Beginning Balance, shares at Jun. 30, 2020	22,311
Issuance of common stock		49			49
Issuance of common stock, shares	10
Exercise and issuance of employee stock options		231			231
Net income			4,516		4,516
Dividends paid on common stock			(1,116)		(1,116)
Other comprehensive income (loss)				1,329	1,329
Ending Balance at Sep. 30, 2020	$ 223	$ 150,708	$ 9,300	$ 5,559	$ 165,790
Ending Balance, shares at Sep. 30, 2020	22,321