Derivative Instruments And Hedging Activities (Consolidated Statements Of Financial Condition Related To Fair Value Of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Assets [Member]
Derivative [Line Items]
Cash flow hedge interest rate caps and swaps	$ 174	$ 294
Fair value hedge interest rate swaps	893	852
Total derivatives designated as hedging instruments	1,067	1,146
Total derivatives not designated as hedging instruments	5,414	4,065
Other Liabilities [Member]
Derivative [Line Items]
Cash flow hedge interest rate caps and swaps	13,162	15,649
Fair value hedge interest rate swaps	2,009	2,140
Total derivatives designated as hedging instruments	15,171	17,789
Total derivatives not designated as hedging instruments	5,409	4,065
Interest Rate Swaps [Member] | Other Assets [Member]
Derivative [Line Items]
Total derivatives not designated as hedging instruments	5,414	4,065
Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative [Line Items]
Total derivatives not designated as hedging instruments	$ 5,409	$ 4,065