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 (ASU 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		485,820				485,820
Other comprehensive income		57,207							57,207
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		11,348			25,578			(14,230)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				426,123
Cash dividends on common stock		(114,796)				(114,796)
Ending balance at Sep. 30, 2019		4,882,664			1,817,266	3,545,824		(479,459)	(967)
Ending balance (in shares) at Sep. 30, 2019				145,567,712
Beginning balance at Jun. 30, 2019		4,734,593			1,809,062	3,414,901		(479,398)	(9,972)
Beginning balance (in shares) at Jun. 30, 2019				145,546,569
Increase (Decrease) in Stockholders' Equity
Net income		171,416				171,416
Other comprehensive income		9,005							9,005
Net activity of common stock pursuant to various stock compensation plans and agreements		8,143			8,204			(61)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				21,143
Cash dividends on common stock		(40,493)				(40,493)
Ending balance at Sep. 30, 2019		4,882,664			1,817,266	3,545,824		(479,459)	(967)
Ending balance (in shares) at Sep. 30, 2019				145,567,712
Beginning balance at Dec. 31, 2019		5,017,617			1,826,512	3,689,377		(479,864)	(18,408)
Beginning balance (ASU 2016-13) at Dec. 31, 2019	[2]		$ (97,967)				$ (97,967)
Beginning balance (in shares) at Dec. 31, 2019				145,625,385
Increase (Decrease) in Stockholders' Equity
Net income		403,713				403,713
Other comprehensive income		51,722							51,722
Net activity of common stock pursuant to various stock compensation plans and agreements		16,395			24,051			(7,656)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				353,727
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		(119,408)				(119,408)
Ending balance at Sep. 30, 2020		5,126,106			1,850,563	3,875,715		(633,486)	33,314
Ending balance (in shares) at Sep. 30, 2020				141,507,430
Beginning balance at Jun. 30, 2020		4,987,243			1,841,915	3,755,649		(633,455)	23,134
Beginning balance (in shares) at Jun. 30, 2020				141,486,397
Increase (Decrease) in Stockholders' Equity
Net income		159,537				159,537
Other comprehensive income		10,180							10,180
Net activity of common stock pursuant to various stock compensation plans and agreements		8,617			8,648			(31)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				21,033
Cash dividends on common stock		(39,471)				(39,471)
Ending balance at Sep. 30, 2020		$ 5,126,106			$ 1,850,563	$ 3,875,715		$ (633,486)	$ 33,314
Ending balance (in shares) at Sep. 30, 2020				141,507,430

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

[2] Represents the impact of the adoption of ASU 2016-13, Financial Instruments — Credit Losses (Topic 326) on January 1, 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.