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Commitments and Contingencies - Narrative (Details) (USD $)
 9 Months Ended 0 Months Ended 1 Months Ended
Sep. 30, 2014
Loan
Sep. 30, 2013
Loan
Sep. 30, 2014
Mortgage Servicing Practice [Member]
Dec. 19, 2013
Unfavorable Regulatory Action [Member]
Sep. 30, 2014
Unfavorable Regulatory Action [Member]
May 31, 2014
Unfavorable Regulatory Action [Member]
Dec. 19, 2013
Unfavorable Regulatory Action [Member]
Minimum [Member]
Feb. 28, 2014
Wells Fargo [Member]
Loan
Loss Contingencies [Line Items]                
Estimate of possible loss     $ 19,100,000   $ 100,000,000      
Mortgage loans on real estate, number of acquired loans on hold               184,000
Acquisitions               39,000,000,000
Oversight monitor period       3 years        
Consumer relief fund payment       127,300,000        
Consumer relief fund, former owner's responsibility amount           60,400,000    
Consumer relief fund, former owner's responsibility amount received           49,000,000    
Principal forgiveness modification program, aggregate amount             2,000,000,000.0  
Principal forgiveness modification program, term       3 years        
Provided or assumed representation and warranty obligations of unpaid principal balance 83,400,000,000 89,400,000,000            
Warranty repurchase demands unpaid principal balance $ 108,200,000 $ 113,000,000            
Warranty repurchase demands number of loans 578 534