Premises and Equipment (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment Textuals [Abstract]
Depreciation and amortization	$ 34us-gaap_Depreciation	$ 33us-gaap_Depreciation	$ 30us-gaap_Depreciation
Rental expense under leases	$ 12us-gaap_OperatingLeasesRentExpenseNet	$ 14us-gaap_OperatingLeasesRentExpenseNet	$ 15us-gaap_OperatingLeasesRentExpenseNet

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration