Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Previously Reported [Member]	Common Stock [Member]	Common Stock [Member] Previously Reported [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Previously Reported [Member]	Retained Earnings [Member]	Retained Earnings [Member] Previously Reported [Member]	Accumulated Other Comprehensive Income (Loss), net [Member]	Accumulated Other Comprehensive Income (Loss), net [Member] Previously Reported [Member]	Treasury Stock [Member]	Treasury Stock [Member] Previously Reported [Member]
Beginning balance at Dec. 31, 2019	$ 1,055,665		$ 113,915		$ 493,737		$ 577,348		$ 5,579		$ (134,914)
Beginning balance, shares at Dec. 31, 2019			98,311,840
Net Income	28,578						28,578
Other comprehensive income (loss)	15,943								15,943
Dividends, declared (USD per share)	(21,614)						(21,614)
Treasury stock acquired	(5,220)										(5,220)
Treasury stock acquired, shares			(430,896)
Stock Issued During Period, Value, Treasury Stock Reissued	1,816				458		0				1,358
Stock Issued During Period, Shares, Treasury Stock Reissued			158,453
Restricted stock	537		$ 0		487		0				50
Restricted stock, shares			93,300
Stock Issued During Period, Value, Treasury Stock Reissued	1,594
Ending balance at Jun. 30, 2020	$ 1,075,705		$ 113,915		494,682		584,312		21,522		(138,726)
Ending balance, shares at Jun. 30, 2020			98,132,697
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.220
Beginning balance at Mar. 31, 2020		$ 1,057,924		$ 113,915		$ 494,181		$ 571,256		$ 17,352		$ (138,780)
Beginning balance, shares at Mar. 31, 2020				98,015,396
Net Income	$ 23,851						23,851
Other comprehensive income (loss)	4,170								4,170
Dividends, declared (USD per share)	(10,795)						(10,795)
Treasury stock acquired	0										0
Treasury stock acquired, shares			0
Stock Issued During Period, Value, Treasury Stock Reissued	222				14		0				208
Stock Issued During Period, Shares, Treasury Stock Reissued			24,001
Restricted stock	333		$ 0		487		0				(154)
Restricted stock, shares			93,300
Ending balance at Jun. 30, 2020	$ 1,075,705		$ 113,915		494,682		584,312		21,522		(138,726)
Ending balance, shares at Jun. 30, 2020			98,132,697
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.110
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		96,130,751
Net Income	$ 69,389						69,389
Other comprehensive income (loss)	(10,118)								(10,118)
Dividends, declared (USD per share)	(21,641)						(21,641)
Treasury stock acquired	(2,658)										(2,658)
Treasury stock acquired, shares			(196,119)
Stock Issued During Period, Value, Treasury Stock Reissued	2,264				771		0				1,493
Stock Issued During Period, Shares, Treasury Stock Reissued			173,907
Restricted stock	566		$ 0		445		0				121
Restricted stock, shares			93,089
Stock Issued During Period, Value, Treasury Stock Reissued	2,042
Ending balance at Jun. 30, 2021	$ 1,106,419		$ 113,915		495,899		644,362		7,115		(154,872)
Ending balance, shares at Jun. 30, 2021	96,201,628		96,201,628
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.225
Beginning balance at Mar. 31, 2021	$ 1,087,480		$ 113,915		495,720		625,806		6,198		(154,159)
Beginning balance, shares at Mar. 31, 2021			96,248,476
Net Income	29,619						29,619
Other comprehensive income (loss)	917								917
Dividends, declared (USD per share)	(11,063)						(11,063)
Treasury stock acquired	(1,015)										(1,015)
Treasury stock acquired, shares			(72,724)
Stock Issued During Period, Value, Treasury Stock Reissued	223				90		0				133
Stock Issued During Period, Shares, Treasury Stock Reissued			15,376
Restricted stock	258		$ 0		89		0				169
Restricted stock, shares			10,500
Ending balance at Jun. 30, 2021	$ 1,106,419		$ 113,915		$ 495,899		$ 644,362		$ 7,115		$ (154,872)
Ending balance, shares at Jun. 30, 2021	96,201,628		96,201,628
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.115