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, 2019	$ 557,608	$ 2,005	$ 139,694	$ 492,055	$ (7,501)	$ (68,645)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	38,105	0	0	38,105	0	0
Other comprehensive income (loss)	19,622	0	0	0	19,622	0
Omnibus Equity Incentive Plan	615	1	614	0	0	0
Payments for Repurchase of Common Stock	(1,724)		0	0	0
Dividends, Common Stock, Cash	(7,131)	0	0	(7,131)	0	0
Balance at Sep. 30, 2020	607,095	2,006	140,308	523,029	12,121	(70,369)
Balance at Jun. 30, 2020	590,284	2,006	140,103	509,029	9,515	(70,369)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	14,000	0	0	14,000	0	0
Other comprehensive income (loss)	2,606	0	0	0	2,606	0
Omnibus Equity Incentive Plan	205	0	205	0	0	0
Balance at Sep. 30, 2020	607,095	2,006	140,308	523,029	12,121	(70,369)
Balance at Dec. 31, 2020	596,992	2,007	140,820	521,103	9,764	(76,702)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	45,589	0	0	45,589	0	0
Other comprehensive income (loss)	(10,866)	0	0	0	(10,866)	0
Omnibus Equity Incentive Plan	638	2	636	0	0	0
Payments for Repurchase of Common Stock	(30,419)		0	0	0
Dividends, Common Stock, Cash	(6,999)	0	0	(6,999)	0	0
Balance at Sep. 30, 2021	594,935	2,009	141,456	559,693	(1,102)	(107,121)
Balance at Jun. 30, 2021	588,163	2,008	141,240	543,595	1,412	(100,092)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	16,098	0	0	16,098	0	0
Other comprehensive income (loss)	(2,514)	0	0	0	(2,514)	0
Omnibus Equity Incentive Plan	217	1	216	0	0	0
Balance at Sep. 30, 2021	$ 594,935	$ 2,009	$ 141,456	$ 559,693	$ (1,102)	$ (107,121)