Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), net [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2020	$ 1,068,617	$ 113,915	$ 494,683	$ 596,614	$ 17,233	$ (153,828)
Beginning balance, shares at Dec. 31, 2020		96,130,751
Net Income	39,770			39,770
Total other comprehensive (loss) income	(11,035)				(11,035)
Dividends, declared (USD per share)	(10,578)			(10,578)
Treasury stock acquired	(1,643)					(1,643)
Treasury stock acquired, shares		(123,395)
Stock Issued During Period, Value, Treasury Stock Reissued	2,041		681	0		1,360
Stock Issued During Period, Shares, Treasury Stock Reissued		158,531
Restricted stock	308	$ 0	356	0		(48)
Restricted stock, shares		82,589
Stock Issued During Period, Value, Treasury Stock Reissued	2,041
Ending balance at Mar. 31, 2021	$ 1,087,480	$ 113,915	495,720	625,806	6,198	(154,159)
Ending balance, shares at Mar. 31, 2021		96,248,476
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.110
Beginning balance at Dec. 31, 2021	$ 1,109,372	$ 113,915	496,121	691,260	(8,768)	(183,156)
Beginning balance, shares at Dec. 31, 2021	94,233,152	94,233,152
Net Income	$ 27,726			27,726
Total other comprehensive (loss) income	(59,392)				(59,392)
Dividends, declared (USD per share)	(10,837)			(10,837)
Treasury stock acquired	(1,488)					(1,488)
Treasury stock acquired, shares		(90,614)
Stock Issued During Period, Value, Treasury Stock Reissued	1,947		499	0		1,448
Stock Issued During Period, Shares, Treasury Stock Reissued		157,251
Restricted stock	291	$ 0	7	0		284
Restricted stock, shares		(750)
Stock Issued During Period, Value, Treasury Stock Reissued	1,947
Ending balance at Mar. 31, 2022	$ 1,067,619	$ 113,915	$ 496,627	$ 708,149	$ (68,160)	$ (182,912)
Ending balance, shares at Mar. 31, 2022	94,299,039	94,299,039
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.115