Derivative Financial Instruments (Schedule of Weighted-Average Rates Paid and Received for Interest Rate Swaps Outstanding) (Details)	6 Months Ended
	Jun. 30, 2011
Weighted-average strike rate outstanding interest rate caps	3.10%
Weighted-Average Interest Rate Paid [Member] | Interest Rate Swaps [Member]
Fair value hedge commercial loan/lease interest rate swaps	4.49%
Cash flow hedge interest rate swaps on junior subordinated deferrable interest debentures	5.47%
Non-hedging interest rate swaps	5.08%
Non-hedging interest rate swaps (2)	1.80%
Weighted-Average Interest Rate Received [Member] | Interest Rate Swaps [Member]
Fair value hedge commercial loan/lease interest rate swaps	0.19%
Cash flow hedge interest rate swaps on junior subordinated deferrable interest debentures	1.80%
Non-hedging interest rate swaps	1.80%
Non-hedging interest rate swaps (2)	5.08%