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Financial Guarantees Risk Characteristics - Multifamily (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Single-Family [Member] | Guaranty Book of Business [Member] | Conventional Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of loans with detailed loan level information 99.00% 99.00%
Multifamily [Member] | Guaranty Book of Business [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of loans with detailed loan level information 99.00% 99.00%
Multifamily [Member] | Guaranty Book of Business [Member] | Current Debt Service Coverage Ratio Less Than 1.0 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 3.00% [1],[2],[3] 4.00% [1],[2],[3]
Loans seriously delinquent, percentage by unpaid principal balance 0.76% [1],[2],[4],[5] 1.09% [1],[2],[4],[5]
Multifamily [Member] | Guaranty Book of Business [Member] | Original Loan to Value Ratio Greater Than 80% [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 3.00% [2],[3] 3.00% [2],[3]
Loans seriously delinquent, percentage by unpaid principal balance 0.05% [2],[4],[5] 0.23% [2],[4],[5]
Multifamily [Member] | Guaranty Book of Business [Member] | Original Loan to Value Ratio Less Than or Equal to 80% [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 97.00% [2],[3] 97.00% [2],[3]
Loans seriously delinquent, percentage by unpaid principal balance 0.09% [2],[4],[5] 0.10% [2],[4],[5]
Minimum [Member] | Single-Family [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 90 days 90 days
Minimum [Member] | Multifamily [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 60 days 60 days
Current Debt service coverage ratio reporting lag 3 months 3 months
Maximum [Member] | Multifamily [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 89 days 89 days
Current Debt service coverage ratio reporting lag 6 months 6 months
[1] Our estimates of current DSCRs are based on the latest available income information for these properties. Although we use the most recently available results of our multifamily borrowers, there is a lag in reporting, which typically can range from 3 to 6 months but in some cases may be longer.
[2] Consists of the portion of our multifamily guaranty book of business for which we have detailed loan level information, which constituted approximately 99% of our total multifamily guaranty book of business as of September 30, 2014 and December 31, 2013 excluding loans that have been defeased.
[3] Calculated based on the aggregate unpaid principal balance of multifamily loans for each category divided by the aggregate unpaid principal balance of loans in our multifamily guaranty book of business.
[4] Consists of multifamily loans that were 60 days or more past due as of the dates indicated.
[5] Calculated based on the unpaid principal balance of multifamily loans that were seriously delinquent divided by the aggregate unpaid principal balance of multifamily loans for each category included in our guaranty book of business.