Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	Cumulative Effect, Period Of Adoption, Adjustment	Common Stock	Common Stock and Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period Of Adoption, Adjustment	Treasury Stock	AOCI, Net of Tax
Beginning balance at Dec. 31, 2018		$ 4,423,974			$ 1,789,977	$ 3,160,132		$ (467,961)	$ (58,174)
Beginning balance (Accounting Standards Update 2016-02) at Dec. 31, 2018	[1]		$ 14,668				$ 14,668
Beginning balance (in shares) at Dec. 31, 2018				144,961,363
Increase (Decrease) in Stockholders' Equity
Net income		314,404				314,404
Other comprehensive income (loss)		48,202							48,202
Warrants exercised		4,443			1,711			2,732
Warrants exercised (in shares)				180,226
Net activity of common stock pursuant to various stock compensation plans and agreements		3,205			17,374			(14,169)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				404,980
Cash dividends on common stock		(74,303)				(74,303)
Ending balance at Jun. 30, 2019		$ 4,734,593			1,809,062	3,414,901		(479,398)	(9,972)
Ending balance (in shares) at Jun. 30, 2019				145,546,569
Accounting Standards Update [Extensible List]	[2]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance at Dec. 31, 2018		$ 4,423,974			1,789,977	3,160,132		(467,961)	(58,174)
Beginning balance (Accounting Standards Update 2016-02) at Dec. 31, 2018	[1]		14,668				14,668
Beginning balance (in shares) at Dec. 31, 2018				144,961,363
Ending balance at Dec. 31, 2019		5,017,617			1,826,512	3,689,377		(479,864)	(18,408)
Ending balance (Accounting Standards Update 2016-13) at Dec. 31, 2019	[2]		$ (97,967)				$ (97,967)
Ending balance (in shares) at Dec. 31, 2019				145,625,385
Beginning balance at Mar. 31, 2019		4,591,930			1,799,124	3,305,054		(479,265)	(32,983)
Beginning balance (in shares) at Mar. 31, 2019				145,501,301
Increase (Decrease) in Stockholders' Equity
Net income		150,380				150,380
Other comprehensive income (loss)		23,011							23,011
Net activity of common stock pursuant to various stock compensation plans and agreements		9,805			9,938			(133)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				45,268
Cash dividends on common stock		(40,533)				(40,533)
Ending balance at Jun. 30, 2019		$ 4,734,593			1,809,062	3,414,901		(479,398)	(9,972)
Ending balance (in shares) at Jun. 30, 2019				145,546,569
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Beginning balance at Dec. 31, 2019		$ 5,017,617			1,826,512	3,689,377		(479,864)	(18,408)
Beginning balance (in shares) at Dec. 31, 2019				145,625,385
Increase (Decrease) in Stockholders' Equity
Net income		244,176				244,176
Other comprehensive income (loss)		41,542							41,542
Net activity of common stock pursuant to various stock compensation plans and agreements		7,778			15,403			(7,625)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				332,694
Repurchase of common stock pursuant to the Stock Repurchase Program		(145,966)						(145,966)
Repurchase of common stock pursuant to the Stock Repurchase Program (in shares)				(4,471,682)
Cash dividends on common stock		(79,937)				(79,937)
Ending balance at Jun. 30, 2020		4,987,243			1,841,915	3,755,649		(633,455)	23,134
Ending balance (in shares) at Jun. 30, 2020				141,486,397
Beginning balance at Mar. 31, 2020		4,902,985			1,833,784	3,695,759		(633,439)	6,881
Beginning balance (in shares) at Mar. 31, 2020				141,435,099
Increase (Decrease) in Stockholders' Equity
Net income		99,352				99,352
Other comprehensive income (loss)		16,253							16,253
Net activity of common stock pursuant to various stock compensation plans and agreements		8,115			8,131			(16)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				51,298
Cash dividends on common stock		(39,462)				(39,462)
Ending balance at Jun. 30, 2020		$ 4,987,243			$ 1,841,915	$ 3,755,649		$ (633,455)	$ 23,134
Ending balance (in shares) at Jun. 30, 2020				141,486,397

[1] Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) and subsequent related ASUs in the first quarter of 2019.

[2] Represents the impact of the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) in the first quarter of 2020. Refer to Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Quarterly Report on Form 10-Q (“this Form 10-Q”) for additional information.