CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2017	$ 413,569	$ 1,822	$ 75,624	$ 420,275	$ (14,704)	$ (69,448)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,527	0	0	35,527	0	0
Other comprehensive income (loss)	(15,240)	0	0	0	(15,240)	0
Omnibus Equity Incentive Plan	559	2	557	0	0	0
Payments for Repurchase of Common Stock	(391)		0	0	0
Dividends, Common Stock, Cash	(6,250)	0	0	(6,250)	0	0
Balance at Sep. 30, 2018	427,774	1,824	76,181	451,918	(32,310)	(69,839)
Balance at Jun. 30, 2018	419,695	1,823	75,995	440,605	(28,889)	(69,839)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,313	0	0	11,313	0	0
Other comprehensive income (loss)	(3,421)	0	0	0	(3,421)	0
Omnibus Equity Incentive Plan	187	1	186	0	0	0
Balance at Sep. 30, 2018	427,774	1,824	76,181	451,918	(32,310)	(69,839)
Balance at Dec. 31, 2018	442,701	1,824	76,774	456,716	(23,454)	(69,159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	34,508	0	0	34,508	0	0
Other comprehensive income (loss)	23,599	0	0	0	23,599	0
Omnibus Equity Incentive Plan	601	2	599	0	0	0
Payments for Repurchase of Common Stock	(315)		0	0	0
Dividends, Common Stock, Cash	(6,390)	0	0	(6,390)	0	0
Balance at Sep. 30, 2019	556,582	2,004	139,073	484,834	145	(69,474)
Balance at Jun. 30, 2019	477,820	1,826	77,173	472,577	(4,282)	(69,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,257	0	0	12,257	0	0
Other comprehensive income (loss)	4,427	0	0	0	4,427	0
Omnibus Equity Incentive Plan	200	0	200	0	0	0
Balance at Sep. 30, 2019	$ 556,582	$ 2,004	$ 139,073	$ 484,834	$ 145	$ (69,474)