Acquisitions Acquisitions (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015		Apr. 07, 2014	Dec. 31, 2014	Mar. 31, 2014
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Apr. 07, 2014
Goodwill	$ 1,728,380	[1]		$ 1,720,479	$ 208,743
Capitalsource, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			Apr. 07, 2014
Goodwill			$ 1,526,282

[1] The increase in goodwill for the Community Banking segment and National Lending segment compared to March 31, 2014, was due primarily to $1.5 billion from the CapitalSource Inc. merger.