Derivative Financial Instruments (Schedule Of Weighted-Average Rates Paid And Received For Interest Rate Swaps Outstanding) (Detail) (Interest Rate Swaps [Member])	Sep. 30, 2012
Weighted-Average Interest Rate Paid [Member]
Weighted Average Discount Rate [Line Items]
Fair value hedge commercial loan/lease interest rate swaps	3.12%
Cash flow hedge interest rate swaps on junior subordinated deferrable interest debentures	5.47%
Non-hedging interest rate swaps	1.77%
Non-hedging interest rate swaps	4.54%
Weighted-Average Interest Rate Received [Member]
Weighted Average Discount Rate [Line Items]
Fair value hedge commercial loan/lease interest rate swaps	0.22%
Cash flow hedge interest rate swaps on junior subordinated deferrable interest debentures	1.97%
Non-hedging interest rate swaps	4.54%
Non-hedging interest rate swaps	1.77%