Business Segment Business Segment (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014		Dec. 31, 2012	Dec. 31, 2013		Dec. 31, 2011
Segment Reporting (Textuals) [Abstract]
Goodwill		$ 1,720,479	[1]	$ 79,866	$ 208,743	[1]	$ 39,141
Goodwill, Acquired During Period		$ 1,518,381		$ 19,033
Date of asset-based lending companies reorganization & sale of Celtic Corporation	Jul. 01, 2014

[1] (1)The increase in the goodwill for the Community Banking segment and National Lending segment during 2014 was due primarily to $1.5 billion from the CapitalSource merger.