Commitments and Contingencies (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015 properties	Mar. 31, 2014	Dec. 31, 2014
Loss Contingencies [Line Items]
Litigation settlement other company owned stock	$ 4,400,000,000
Number of non-cancelable operating leases	281
Rent expense	9,300,000	5,000,000
Rent income	118,000	177,000
Losses in connection with standby letters of credit	0	0
Standby letters of credit that expire thereafter	8,800,000
Standby letters of credit that expire within one year	47,800,000
Fair value of guarantee with standby letters of credit	1,100,000
Residential mortgage loan repurchase reserve liability	3,300,000
Concentration risk, percentage	80.00%		80.00%
Visa Inc [Member]
Loss Contingencies [Line Items]
Other company stock owned shares	483,806
Conversion ratio from Class B shares into Class A shares	164.83%
Value of the Class A shares	$ 65.48
Unredeemed Class A equivalent shares owned	$ 52,200,000