CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2017	$ 294,265	$ 177,458	$ 167,852	$ (18,685)	$ (32,360)
Balance, shares at Dec. 31, 2017		49,800,126
Net income	8,556		8,556
Other comprehensive income (loss)	(3,990)			(3,990)
Stock option exercises, value	229	$ (284)			513
Stock option exercises, shares		68,801
Stock option expense	13	$ 13
Restricted stock grants, value		$ (207)			207
Restricted stock grants, shares		27,702
Restricted stock forfeitures, shares		(807)
Restricted stock expense	242	$ 248			(6)
Vesting of Long-term Incentive Plan, value	344	$ 69			275
Vesting of Long-term Incentive Plan, shares		36,871
Cash dividend payments	(2,989)		(2,989)
Treasury stock purchases, value	(475)				(475)
Treasury stock purchases, shares		(50,202)
Balance at Mar. 31, 2018	296,195	$ 177,297	173,419	(22,675)	(31,846)
Balance, shares at Mar. 31, 2018		49,882,491
Balance at Dec. 31, 2018	309,334	$ 177,492	192,062	(21,436)	(38,784)
Balance, shares at Dec. 31, 2018		49,128,875
Net income	8,656		8,656
Other comprehensive income (loss)	3,020			3,020
Stock option exercises, value	$ 70	$ (187)			257
Stock option exercises, shares	33,000	33,000
Stock option expense	$ 6	$ 6
Restricted stock grants, value		$ (148)			148
Restricted stock grants, shares		18,969
Restricted stock forfeitures, value		$ 6			(6)
Restricted stock forfeitures, shares		(834)
Restricted stock expense	143	$ 143
Vesting of Long-term Incentive Plan, value	523	$ 98			425
Vesting of Long-term Incentive Plan, shares		54,463
Cash dividend payments	(3,432)		(3,432)
Treasury stock purchases, value	(3,611)				(3,611)
Treasury stock purchases, shares		(381,785)
Balance at Mar. 31, 2019	$ 314,709	$ 177,410	$ 197,286	$ (18,416)	$ (41,571)
Balance, shares at Mar. 31, 2019		48,852,688