Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Loss Contingencies [Line Items]
Number of non-cancelable operating leases	140		140
Rent expense	$ 4,300,000	$ 4,000,000	$ 8,600,000	$ 8,200,000
Rent income	304,000	200,000	608,000	472,000
Losses in connection with standby letters of credit	0	0	0	0
Standby letters of credit that expire within one year	26,800,000		26,800,000
Standby letters of credit that expire thereafter	32,500,000		32,500,000
Litigation settlement other company owned stock	4,100,000,000		4,100,000,000
Fair value of guarantee with standby letters of credit	255,000		255,000
Concentration risk, other risk, percentage			79		79
Visa Inc [Member]
Loss Contingencies [Line Items]
Other company stock owned shares	468,659		468,659
Conversion ratio from Class B shares into Class A shares			0.4206
Value of the Class A shares	$ 123.60		$ 123.60
Unredeemed Class A equivalent shares owned			$ 24,400,000