Derivative Financial Instruments (Schedule Of Notional Amounts And Estimated Fair Values Of Interest Rate Derivative Contracts) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Notional Amount [Member] | Interest Rate Derivatives Designated As Hedges Of Fair Value [Member]
Commercial loan/lease interest rate swaps	$ 81,989	$ 104,088
Notional Amount [Member] | Interest Rate Derivatives Designated As Hedges Of Cash Flows [Member]
Interest rate swaps on junior subordinated deferrable interest debentures	120,000	120,000
Notional Amount [Member] | Non-Hedging Interest Rate Derivatives [Member]
Commercial loan/lease interest rate swaps	579,750	593,792
Commercial loan/lease interest rate swaps (2)	579,750	593,792
Commercial loan/lease interest rate caps	20,000	20,000
Commercial loan/lease interest rate caps (2)	20,000	20,000
Estimated Fair Value [Member] | Interest Rate Derivatives Designated As Hedges Of Fair Value [Member]
Commercial loan/lease interest rate swaps	(8,805)	(8,350)
Estimated Fair Value [Member] | Interest Rate Derivatives Designated As Hedges Of Cash Flows [Member]
Interest rate swaps on junior subordinated deferrable interest debentures	(9,137)	(9,895)
Estimated Fair Value [Member] | Non-Hedging Interest Rate Derivatives [Member]
Commercial loan/lease interest rate swaps	61,127	44,335
Commercial loan/lease interest rate swaps (2)	(61,410)	(44,666)
Commercial loan/lease interest rate caps	66	388
Commercial loan/lease interest rate caps (2)	$ (66)	$ (388)