Mortgage Banking Activities Mortgage Banking Activities, Loans Serviced for Others (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	$ 13,355,479
Loans Serviced For Others, 30 To 59 Days Past Due	220,221
Loans Serviced For Others, 60 To 89 Days Past Due	63,003
Loans Serviced For Others, Greater Than 90 Days or More Past Due	80,239
Loans Serviced For Others	13,718,942
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	4,557,381
Loans Serviced For Others, 30 To 59 Days Past Due	42,359
Loans Serviced For Others, 60 To 89 Days Past Due	10,926
Loans Serviced For Others, Greater Than 90 Days or More Past Due	36,890
Loans Serviced For Others	4,647,556
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	4,111,774
Loans Serviced For Others, 30 To 59 Days Past Due	26,284
Loans Serviced For Others, 60 To 89 Days Past Due	7,828
Loans Serviced For Others, Greater Than 90 Days or More Past Due	20,658
Loans Serviced For Others	4,166,544
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	4,475,016
Loans Serviced For Others, 30 To 59 Days Past Due	149,707
Loans Serviced For Others, 60 To 89 Days Past Due	43,702
Loans Serviced For Others, Greater Than 90 Days or More Past Due	18,113
Loans Serviced For Others	4,686,538
Other Investor Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loans Serviced For Others, Current	211,308
Loans Serviced For Others, 30 To 59 Days Past Due	1,871
Loans Serviced For Others, 60 To 89 Days Past Due	547
Loans Serviced For Others, Greater Than 90 Days or More Past Due	4,578
Loans Serviced For Others	$ 218,304