Mortgage Banking Activities Mortgage Banking Activities, Loans Serviced for Others (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	$ 14,306,572
Loans Serviced For Others, 30 To 59 Days Past Due	194,205
Loans Serviced For Others, 60 To 89 Days Past Due	54,417
Loans Serviced For Others, Greater Than 90 Days or More Past Due	71,097
Loans Serviced For Others	14,626,291
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	4,681,165
Loans Serviced For Others, 30 To 59 Days Past Due	36,913
Loans Serviced For Others, 60 To 89 Days Past Due	9,828
Loans Serviced For Others, Greater Than 90 Days or More Past Due	31,543
Loans Serviced For Others	4,759,449
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	4,628,707
Loans Serviced For Others, 30 To 59 Days Past Due	25,380
Loans Serviced For Others, 60 To 89 Days Past Due	7,206
Loans Serviced For Others, Greater Than 90 Days or More Past Due	20,149
Loans Serviced For Others	4,681,442
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	4,538,079
Loans Serviced For Others, 30 To 59 Days Past Due	125,530
Loans Serviced For Others, 60 To 89 Days Past Due	35,461
Loans Serviced For Others, Greater Than 90 Days or More Past Due	14,487
Loans Serviced For Others	4,713,557
Other Investor Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	458,621
Loans Serviced For Others, 30 To 59 Days Past Due	6,382
Loans Serviced For Others, 60 To 89 Days Past Due	1,922
Loans Serviced For Others, Greater Than 90 Days or More Past Due	4,918
Loans Serviced For Others	$ 471,843