Goodwill and Other Intangible Assets (Details) - USD ($)	3 Months Ended	9 Months Ended
	Mar. 31, 2015	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Subsequent Recognition of Deferred Tax Asset	$ 7,900,000	$ 7,901,000
Goodwill [Roll Forward]
Balance, December 31, 2014	$ 1,720,479,000	1,720,479,000
Adjustment to acquired CapitalSource Inc. deferred tax assets		0	$ 0
Balance, September 30, 2015		$ 1,728,380,000