Consolidated Statement of Shareholders' Equity - USD ($)	Total	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, 2012		37,420,909
Total stockholders' equity at Dec. 31, 2012	$ 589,121,000	$ 377,000	$ 1,062,184,000	$ (499,537,000)	$ (6,803,000)	$ 32,900,000
Net Income	45,115,000			45,115,000
Other comprehensive income - net unrealized gain on securities available-for-sale, net of tax	(36,247,000)					(36,247,000)
Issuance of common stock for merger with CapitalSource Inc., shares		8,403,119
Issuance of common stock for merger with CapitalSource Inc.	242,268,000	$ 84,000	242,184,000
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares		350,446
Restricted stock awarded and earned stock compensation, net of shares forfeited	21,246,000	$ 4,000	21,242,000
Restricted stock surrendered, shares		(351,640)
Restricted stock surrendered	(13,537,000)				(13,537,000)
Tax effect from vesting of restricted stock	2,133,000		2,133,000
Cash dividends paid	(41,006,000)		(41,006,000)
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)
Shares, Outstanding at Dec. 31, 2013		45,822,834
Cumulative Effect of New Accounting Principle in Period of Adoption	(195,000)			(195,000)
Net Income	168,905,000			168,905,000
Other comprehensive income - net unrealized gain on securities 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
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares		1,088,493
Restricted stock awarded and earned stock compensation, net of shares forfeited	36,474,000	$ 11,000	36,463,000
Restricted stock surrendered, shares		(493,890)
Restricted stock surrendered	(22,307,000)				(22,307,000)
Dividend reinvestment, shares		2,583
Dividend reinvestment	115,000		115,000
Tax effect from vesting of 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
Other comprehensive income - net unrealized gain on securities 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
Restricted stock awarded and earned stock compensation, net of shares forfeited	15,630,000	$ 5,000	15,625,000
Restricted stock surrendered, shares		(180,822)
Restricted stock surrendered	(8,400,000)		0		(8,400,000)
Dividend reinvestment, shares		1,300
Dividend reinvestment	58,000		58,000
Tax effect from vesting of 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