Derivative Financial Instruments (Schedule Of Notional Amounts And Estimated Fair Values Of Interest Rate Derivative Contracts Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Notional Amount [Member] | Interest Rate Derivatives Designated As Hedges Of Fair Value [Member]
Derivatives, Fair Value [Line Items]
Commercial loan/lease interest rate swaps	$ 67,517	$ 71,181
Notional Amount [Member] | Interest Rate Derivatives Designated As Hedges Of Cash Flows [Member]
Derivatives, Fair Value [Line Items]
Interest rate swap on junior subordinated deferrable interest debentures	120,000	120,000
Notional Amount [Member] | Non-Hedging Interest Rate Derivatives [Member]
Derivatives, Fair Value [Line Items]
Commercial loan/lease interest rate swaps	637,356	613,883
Commercial loan/lease interest rate swaps (2)	637,356	613,883
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]
Derivatives, Fair Value [Line Items]
Commercial loan/lease interest rate swaps	(7,736)	(8,376)
Estimated Fair Value [Member] | Interest Rate Derivatives Designated As Hedges Of Cash Flows [Member]
Derivatives, Fair Value [Line Items]
Interest rate swap on junior subordinated deferrable interest debentures	(7,205)	(7,807)
Estimated Fair Value [Member] | Non-Hedging Interest Rate Derivatives [Member]
Derivatives, Fair Value [Line Items]
Commercial loan/lease interest rate swaps	57,105	61,137
Commercial loan/lease interest rate swaps (2)	(57,314)	(61,393)
Commercial loan/lease interest rate caps	28	50
Commercial loan/lease interest rate caps (2)	$ (28)	$ (50)