Off-Balance-Sheet Arrangements, Commitments, Guarantees And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Off-Balance-Sheet Arrangements, Commitments, Guarantees And Contingencies [Abstract]
Credit card guarantees	$ 7,600,000	$ 5,900,000
Collateralized credit card guarantees	738,000	722,000
Minimum percentage of collateral required for securities borrowed	100.00%
Maximum future payments guaranteed	1,700,000,000
Held in trust liquid assets as collateral	1,700,000,000
Rent expense for operating leases	21,600,000	21,600,000	20,600,000
Aggregate future minimum rentals to be received under non-cancelable subleases greater than one year	473,000
Payments related to branch facility	$ 898,000	$ 852,000	$ 840,000