Loan Servicing Principal Balance of Loans Serviced for Others (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Capitalization Rate for Residental Loan Servicing Portfolio	0.88%	0.71%
Balance of loans serviced for others	$ 7,346,288	$ 5,249,255
Residential Mortgage
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Balance of loans serviced for others	5,899,019	4,132,570
Commercial real estate
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Balance of loans serviced for others	928,214	983,782
Commercial [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Balance of loans serviced for others	$ 519,055	$ 132,903