Securities Available For Sale (Schedule Of Maturities Distribution Of The Amortized Cost And Estimated Fair Value Of Securities Available For Sale) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Securities Available For Sale [Abstract]
Amortized Cost, Due one year of less	$ 1,085
Amortized Cost, Due after one year through five years	1,351
Amortized Cost, Due after five years through ten years	23,482
Amortized Cost, Due after ten years	365,879
Securities Available for Sale, Amortized Cost	391,797	371,211
Estimated Fair Value, Due one year of less	1,098
Estimated Fair Value, Due after one year through five years	1,308
Estimated Fair Value, Due after five years through ten years	24,664
Estimated Fair Value, Due after ten years	377,774
Securities Available for Sale, Estimated Fair Value	$ 404,844	$ 381,880