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, 2015	$ 410,316	$ 1,817	$ 73,396	$ 395,633	$ (9,401)	$ (51,129)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,907	0	0	21,907	0	0
Other comprehensive income (loss)	5,908	0	0	0	5,908	0
Omnibus Equity Incentive Plan	342	1	341	0	0	0
Payments for Repurchase of Common Stock	(19,132)		0	0	0
Dividends, Common Stock, Cash	(6,117)	0	0	(6,117)	0	0
Balance at Jun. 30, 2016	413,224	1,818	73,737	411,423	(3,493)	(70,261)
Balance at Mar. 31, 2016	411,912	1,818	73,566	409,308	(5,059)	(67,721)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,232	0	0	8,232	0	0
Other comprehensive income (loss)	1,566	0	0	0	1,566	0
Omnibus Equity Incentive Plan	171	0	171	0	0	0
Payments for Repurchase of Common Stock	(2,540)	0	0	0	0
Dividends, Common Stock, Cash	(6,117)			(6,117)
Balance at Jun. 30, 2016	413,224	1,818	73,737	411,423	(3,493)	(70,261)
Balance at Dec. 31, 2016	414,395	1,820	74,525	421,826	(14,164)	(69,612)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	17,721	0	0	17,721	0	0
Other comprehensive income (loss)	8,600	0	0	0	8,600	0
Omnibus Equity Incentive Plan	353	1	352	0	0	0
Payments for Repurchase of Common Stock	(503)		0	0	0
Dividends, Common Stock, Cash	(6,112)	0	0	(6,112)	0	0
Balance at Jun. 30, 2017	434,454	1,821	74,877	433,435	(5,564)	(70,115)
Balance at Mar. 31, 2017	426,808	1,820	74,701	431,195	(10,793)	(70,115)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,352	0	0	8,352	0	0
Other comprehensive income (loss)	5,229	0	0	0	5,229	0
Omnibus Equity Incentive Plan	177	1	176	0	0	0
Payments for Repurchase of Common Stock	0	0	0	0	0
Dividends, Common Stock, Cash	(6,112)			(6,112)
Balance at Jun. 30, 2017	$ 434,454	$ 1,821	$ 74,877	$ 433,435	$ (5,564)	$ (70,115)