CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - 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]	Previously Reported [Member]	Previously Reported [Member] Common Stock [Member]	Previously Reported [Member] Additional Paid-in-Capital [Member]	Previously Reported [Member] Retained Earnings [Member]	Previously Reported [Member] Accumulated Other Comprehensive Income (Loss), net [Member]	Previously Reported [Member] Treasury Stock [Member]	Accounting Standards Update 2018-02 [Member]	Accounting Standards Update 2018-02 [Member] Common Stock [Member]	Accounting Standards Update 2018-02 [Member] Additional Paid-in-Capital [Member]	Accounting Standards Update 2018-02 [Member] Retained Earnings [Member]	Accounting Standards Update 2018-02 [Member] Accumulated Other Comprehensive Income (Loss), net [Member]	Accounting Standards Update 2018-02 [Member] Treasury Stock [Member]
Beginning balance at Dec. 31, 2016	$ 749,929	$ 105,563	$ 366,426	$ 412,764	$ (7,027)	$ (127,797)
Beginning balance, Shares Outstanding at Dec. 31, 2016		89,007,077
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	55,165			55,165
Total other comprehensive (loss) Income	854				854
Cash dividends declared	(30,513)			(30,513)
Treasury stock acquired	(1,458)					(1,458)
Treasury stock acquired		(104,257)
Treasury stock reissued	2,557		1,170	0		1,387
Treasury stock reissued, Shares Outstanding		181,211
Restricted stock, Shares Outstanding		21,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	852	$ 0	138	0		714
Stock Issued During Period, Shares, New Issues		8,351,447
Stock Issued During Period, Value, New Issues	110,741	$ 8,352	102,389
Ending balance at Dec. 31, 2017	888,127	$ 113,915	470,123	437,416	(6,173)	(127,154)							$ 888,127	$ 113,915	$ 470,123	$ 438,760	$ (7,517)	$ (127,154)
Ending balance, Shares Outstanding at Dec. 31, 2017		97,456,478												97,456,478
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	0			1,344	(1,344)
Net Income	107,498			107,498
Total other comprehensive (loss) Income	(3,824)				(3,824)
Cash dividends declared	(34,849)			(34,849)
Treasury stock acquired	(26,189)					(26,189)
Treasury stock acquired		(1,920,544)
Treasury stock reissued	44,026		21,579	0		22,447
Treasury stock reissued, Shares Outstanding		2,908,234
Restricted stock, Shares Outstanding		74,500
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	600	$ 0	571	0		29
Ending balance at Dec. 31, 2018	$ 975,389						$ 975,389	$ 113,915	$ 492,273	$ 511,409	$ (11,341)	$ (130,867)
Ending balance, Shares Outstanding at Dec. 31, 2018	98,518,668							98,518,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	$ 105,333			105,333
Total other comprehensive (loss) Income	16,920				16,920
Cash dividends declared	(39,394)			(39,394)
Treasury stock acquired	(6,259)					(6,259)
Treasury stock acquired		(486,849)
Treasury stock reissued	2,744		1,014	0		1,730
Treasury stock reissued, Shares Outstanding		205,021
Restricted stock, Shares Outstanding		75,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	932	$ 0	450	0		482
Ending balance at Dec. 31, 2019	$ 1,055,665	$ 113,915	$ 493,737	$ 577,348	$ 5,579	$ (134,914)
Ending balance, Shares Outstanding at Dec. 31, 2019	98,311,840	98,311,840