Mortgage Banking Activities Mortgage Banking Activities, Loans Serviced for Others (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others current	$ 11,191,254
Loans Serviced For Others30 To59 Days Past Due	207,948
Loans Serviced For Others60 To89 Days Past Due	56,539
Loans Serviced For Otherst Equal To Greater Than90 Days Past Due	108,902
Loans Serviced For Others	11,564,643
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others current	5,000,735
Loans Serviced For Others30 To59 Days Past Due	47,486
Loans Serviced For Others60 To89 Days Past Due	13,663
Loans Serviced For Otherst Equal To Greater Than90 Days Past Due	46,600
Loans Serviced For Others	5,108,484
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others current	1,961,099
Loans Serviced For Others30 To59 Days Past Due	21,050
Loans Serviced For Others60 To89 Days Past Due	5,632
Loans Serviced For Otherst Equal To Greater Than90 Days Past Due	20,711
Loans Serviced For Others	2,008,492
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others current	3,764,570
Loans Serviced For Others30 To59 Days Past Due	129,482
Loans Serviced For Others60 To89 Days Past Due	34,188
Loans Serviced For Otherst Equal To Greater Than90 Days Past Due	27,953
Loans Serviced For Others	3,956,193
Other Investor Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others current	464,850
Loans Serviced For Others30 To59 Days Past Due	9,930
Loans Serviced For Others60 To89 Days Past Due	3,056
Loans Serviced For Otherst Equal To Greater Than90 Days Past Due	13,638
Loans Serviced For Others	$ 491,474