Mortgage Servicing Rights (Schedule Of Information Relates To Serviced Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Mortgage Servicing Rights [Abstract]
Balance of loans serviced for others	$ 2,423,572	$ 2,009,849
MSR as a percentage of serviced loans	0.93%	0.90%