Derivative Financial Instruments (Weighted Average Strike Rates For Interest Rate Caps And Floors Outstanding) (Details)	Dec. 31, 2011
Non-Hedging Commercial Loan Interest Rate Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate caps	2.98%
Non-Hedging Commercial Loan Interest Rate Floors [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate floors	0.99%

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

No definition available.

Name:	us-gaap_DerivativeFloorInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant