Consolidated Statement of Shareholders' Equity - USD ($)	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]
Shares, Outstanding at Dec. 31, 2013		45,822,834
Total stockholders' equity at Dec. 31, 2013	$ 808,898,000	$ 465,000		$ 1,286,737,000	$ (454,617,000)	$ (20,340,000)	$ (3,347,000)
Net Income	168,905,000				168,905,000
available-for-sale, net of tax	29,727,000						29,727,000
Issuance of common stock for merger with CapitalSource Inc., shares		56,601,997
Issuance of common stock for merger with CapitalSource Inc.	2,594,070,000	$ 566,000		2,593,504,000	0	0	0
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares		1,088,493
net of shares forfeited	36,474,000	$ 11,000		36,463,000
Restricted stock surrendered, shares		(493,890)
Stock Repurchase Program	(22,307,000)					(22,307,000)
Dividend reinvestment, shares		2,583
Dividend reinvestment	115,000			115,000
restricted stock	4,625,000			4,625,000
Cash dividends paid	(114,277,000)			(114,277,000)
Total stockholders' equity at Dec. 31, 2014	3,506,230,000	$ 1,042,000		3,807,167,000	(285,712,000)	(42,647,000)	26,380,000
Shares, Outstanding at Dec. 31, 2014		103,022,017
Net Income	299,619,000				299,619,000
available-for-sale, net of tax	1,448,000						1,448,000
Issuance of common stock for merger with CapitalSource Inc., shares		18,135,845
Issuance of common stock for merger with CapitalSource Inc.	797,433,000	$ 181,000		797,252,000
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares		435,387
net of shares forfeited	15,630,000	$ 5,000		15,625,000
Restricted stock surrendered, shares		(180,822)
Stock Repurchase Program	(8,400,000)					(8,400,000)
Dividend reinvestment, shares		1,300
Dividend reinvestment	58,000			58,000
restricted stock	841,000			841,000
Cash dividends paid	(215,168,000)			(215,168,000)
Total stockholders' equity at Dec. 31, 2015	4,397,691,000	$ 1,228,000		4,405,775,000	13,907,000	(51,047,000)	27,828,000
Shares, Outstanding at Dec. 31, 2015		121,413,727
Cumulative Effect of New Accounting Principle in Period of Adoption	195,000
Net Income	352,166,000				352,166,000
available-for-sale, net of tax	(21,846,000)						(21,846,000)
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares			664,135
net of shares forfeited	23,319,000	$ 7,000		23,312,000
Restricted stock surrendered, shares		(141,358)	(652,835)
Stock Repurchase Program	(5,313,000)					(5,313,000)
Common Stock Repurchased Under Stock Repurchase Program, Amount Repurchased	27,931,000			27,924,000		0
restricted stock	4,406,000			4,406,000
Cash dividends paid	(243,437,000)			(243,437,000)
Total stockholders' equity at Dec. 31, 2016	$ 4,479,055,000	$ 1,228,000		$ 4,162,132,000	$ 366,073,000	$ (56,360,000)	$ 5,982,000
Shares, Outstanding at Dec. 31, 2016			121,283,669
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	(7,000)