Fair Value (Details 6) (Level 3)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Mortgage loans held for sale at fair value | Minimum
Quantitative summary of key inputs or assumptions used in the valuation of financial statement items
Discount rate (as a percent)	7.80%
Twelve-month projected housing price index change (as a percent)	6.70%
Prepayment speed (as a percent)	2.10%
Total prepayment speed (as a percent)	3.40%
Mortgage loans held for sale at fair value | Maximum
Quantitative summary of key inputs or assumptions used in the valuation of financial statement items
Discount rate (as a percent)	13.40%
Twelve-month projected housing price index change (as a percent)	7.30%
Prepayment speed (as a percent)	5.60%
Total prepayment speed (as a percent)	5.70%
Mortgage loans held for sale at fair value | Weighted average
Quantitative summary of key inputs or assumptions used in the valuation of financial statement items
Discount rate (as a percent)	9.20%
Twelve-month projected housing price index change (as a percent)	6.80%
Prepayment speed (as a percent)	4.80%
Total prepayment speed (as a percent)	5.10%
IRLCs | Minimum
Quantitative summary of key inputs or assumptions used in the valuation of financial statement items
Pull-through rate (as a percent)	56.60%	61.60%
MSR value expressed as: Servicing fee multiple	2.1	3.2
MSR value expressed as: Percentage of unpaid principal balance	0.40%	0.60%
IRLCs | Maximum
Quantitative summary of key inputs or assumptions used in the valuation of financial statement items
Pull-through rate (as a percent)	98.00%	98.10%
MSR value expressed as: Servicing fee multiple	5.0	4.2
MSR value expressed as: Percentage of unpaid principal balance	2.60%	2.20%
IRLCs | Weighted average
Quantitative summary of key inputs or assumptions used in the valuation of financial statement items
Pull-through rate (as a percent)	78.30%	79.10%
MSR value expressed as: Servicing fee multiple	4.0	4.0
MSR value expressed as: Percentage of unpaid principal balance	1.10%	0.90%