Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock [Member]	Shares Of Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Dividends declared per share (usd per share)		$ 2.00
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	[1]	$ 291			$ 711	$ (420)
Shares, Outstanding at Dec. 31, 2016			121,283,669
Total stockholders' equity at Dec. 31, 2016		4,479,055	$ 1,228		4,162,132	366,073	$ (56,360)	$ 5,982
Net Income		357,818				357,818
Other comprehensive income		25,189						25,189
Stock Issued During Period, Shares, Acquisitions			9,298,451
Issuance of common stock for merger with CapitalSource Inc.		446,233	$ 93		446,140
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares			470,855
net of shares forfeited		25,568	$ 5		25,563
Restricted stock surrendered, shares			(188,870)
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		21
Stock Repurchase Program		(9,476)					(9,476)
Dividend reinvestment, shares			(2,081,227)
Dividend reinvestment		(99,677)			99,656
Common stock, $2.40/share		(247,403)			(247,403)
Total stockholders' equity at Dec. 31, 2017		$ 4,977,598	$ 1,305		4,287,487	723,471	(65,836)	31,171
Shares, Outstanding at Dec. 31, 2017			128,782,878
Dividends declared per share (usd per share)		$ 2.30
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	[2]					(6,136)		6,136
Net Income		$ 465,339				465,339
Other comprehensive income		(43,382)						(43,382)
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares			437,831
net of shares forfeited		29,768	$ 4		29,764
Restricted stock surrendered, shares			(181,642)	5,849,234
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		58
Stock Repurchase Program		(9,149)					(9,149)
Common Stock Repurchased Under Stock Repurchase Program, Amount Repurchased		306,393			306,335
Common stock, $2.40/share		(288,193)			(288,193)
Total stockholders' equity at Dec. 31, 2018		$ 4,825,588	$ 1,251		3,722,723	1,182,674	(74,985)	(6,075)
Shares, Outstanding at Dec. 31, 2018			123,189,833
Dividends declared per share (usd per share)		$ 2.40
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	[3]	$ 938				938
Net Income		468,636				468,636
Other comprehensive income		84,733						84,733
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares			798,248
net of shares forfeited		26,815	$ 8		26,807
Restricted stock surrendered, shares			(218,531)	3,987,945
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		40
Stock Repurchase Program		(8,449)					(8,449)
Common Stock Repurchased Under Stock Repurchase Program, Amount Repurchased		154,516			154,476
Common stock, $2.40/share		(289,048)			(289,048)
Total stockholders' equity at Dec. 31, 2019		$ 4,954,697	$ 1,219		$ 3,306,006	$ 1,652,248	$ (83,434)	$ 78,658
Shares, Outstanding at Dec. 31, 2019			119,781,605

[1] Impact due to adoption on January 1, 2017 of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting."

[2] Impact due to adoption on January 1, 2018 of ASU 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" and ASU 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income."

[3] Impact due to adoption on January 1, 2019 of ASU 2016-02, "Leases (Topic 842)," and the related amendments.