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Mortgage Banking Activities Textuals (Details) (USD $)
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12 Months Ended | |||||||||||
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Dec. 31, 2011
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Dec. 31, 2011
Retained earnings [Member]
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Jun. 30, 2013
Liability For Mortgage Loans Repurchase Losses [Member]
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Jun. 30, 2013
Residential Mortgage Servicing [Member]
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Jun. 30, 2013
Residential Mortgage Servicing [Member]
Election of fair value option [Member]
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Jun. 30, 2013
Amortized [Member]
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Mar. 31, 2013
Amortized [Member]
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Dec. 31, 2012
Amortized [Member]
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Jun. 30, 2012
Amortized [Member]
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Mar. 31, 2012
Amortized [Member]
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Dec. 31, 2011
Amortized [Member]
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Jun. 30, 2013
Amortized [Member]
Residential Mortgage Servicing [Member]
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| Mortgage Banking Activities (Textual) [Abstract] | ||||||||||||
| Residential MSRs transferred from amortized MSRs | $ 315,000,000 | |||||||||||
| Residential MSRs transferred to MSRs carried at Fair Value, Gross | 350,000,000 | |||||||||||
| Residential MSRs transferred to MSRs carried at Fair Value, Net | 313,000,000 | |||||||||||
| Cumulative effect of fair value election for certain residential mortgage servicing rights | 2,000,000 | 2,000,000 | ||||||||||
| Fair Value of amortized MSRs | 316,000,000 | 1,533,000,000 | 1,404,000,000 | 1,400,000,000 | 1,450,000,000 | 1,263,000,000 | 1,756,000,000 | |||||
| Loss Contingency, Range of Possible Loss, Portion Not Accrued | $ 2,200,000,000 | |||||||||||