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Concentrations of Credit Risk Risk Characteristics - SF (Details) - Single-family [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Guaranty Book of Business [Member] | Conventional Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30 days delinquent, percentage (unpaid principal balance) 1.22% 1.27%
60 days delinquent, percentage (unpaid principal balance) 0.34% 0.38%
Seriously delinquent, percentage (unpaid principal balance) 1.74% 1.99%
30 days delinquent, percentage (loan count) 1.39% 1.47%
60 days delinquent, percentage (loan count) 0.38% 0.43%
Seriously delinquent, percentage (loan count) 1.66% 1.89%
Percentage of loans with detailed loan level information 99.00% 99.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2005    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 3.00% 3.00%
Seriously delinquent, percentage (loan count) 5.72% 6.18%
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2006    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 3.00% 3.00%
Seriously delinquent, percentage (loan count) 8.69% 9.61%
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2007    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 4.00% 4.00%
Seriously delinquent, percentage (loan count) 9.89% 10.79%
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2008    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 2.00% 2.00%
Seriously delinquent, percentage (loan count) 5.90% 6.27%
Guaranty Book of Business [Member] | Conventional Loan [Member] | All other vintages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 88.00% 88.00%
Seriously delinquent, percentage (loan count) 0.80% 0.88%
Guaranty Book of Business [Member] | Conventional Loan [Member] | Alt-A    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 4.00% 4.00%
Seriously delinquent, percentage (loan count) 6.96% 7.77%
Guaranty Book of Business [Member] | Conventional Loan [Member] | California    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 20.00% 20.00%
Seriously delinquent, percentage (loan count) 0.62% 0.70%
Guaranty Book of Business [Member] | Conventional Loan [Member] | Florida    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 6.00% 6.00%
Seriously delinquent, percentage (loan count) 3.40% 4.42%
Guaranty Book of Business [Member] | Conventional Loan [Member] | Illinois    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 4.00% 4.00%
Seriously delinquent, percentage (loan count) 2.03% 2.36%
Guaranty Book of Business [Member] | Conventional Loan [Member] | New Jersey    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 4.00% 4.00%
Seriously delinquent, percentage (loan count) 5.35% 5.78%
Guaranty Book of Business [Member] | Conventional Loan [Member] | New York    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 5.00% 5.00%
Seriously delinquent, percentage (loan count) 3.84% 4.17%
Guaranty Book of Business [Member] | Conventional Loan [Member] | All other states    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 61.00% 61.00%
Seriously delinquent, percentage (loan count) 1.36% 1.52%
Guaranty Book of Business [Member] | Conventional Loan [Member] | Estimated mark-to-market loan-to-value ratio greater than 100%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 4.00% 5.00%
Seriously delinquent, percentage (loan count) 10.55% 10.98%
Minimum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 90 days 90 days