Mortgage Servicing Rights (Economic Assumptions) (Details) - $ / loans	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Servicing Asset Key Economic Assumptions [Line Items]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed	13.24%	14.25%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans	56.61	56.02
Conventional fixed loans
Servicing Asset Key Economic Assumptions [Line Items]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate	7.35%	7.20%
All loans excluding conventional fixed loans
Servicing Asset Key Economic Assumptions [Line Items]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate	9.35%	9.20%