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Concentrations of Credit Risk SF Risk Characteristics (Details) - Single-family [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Guaranty Book of Business [Member] | Conventional Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30 days delinquent (percentage of book of business) 1.09% 1.27%
60 days delinquent (percentage of book of business) 0.30% 0.37%
Seriously delinquent (percentage of book of business) 1.47% 1.59%
30 days delinquent (percentage of conventional loans) 1.25% 1.46%
60 days delinquent (percentage of conventional loans) 0.33% 0.41%
Seriously delinquent (percentage of conventional loans) 1.44% 1.55%
Percentage of loans with detailed loan level information 99.00% 99.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | California    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.55% 0.58%
Percentage of book of business 20.00% 20.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | Florida    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 2.56% 2.86%
Percentage of book of business 6.00% 6.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | New Jersey    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 4.46% 4.87%
Percentage of book of business 4.00% 4.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | New York    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 3.32% 3.55%
Percentage of book of business 5.00% 5.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | All other states    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 1.25% 1.34%
Percentage of book of business 65.00% 65.00%
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]    
Seriously delinquent (percentage of conventional loans) 10.37% 10.76%
Percentage of book of business 3.00% 3.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | Alt-A [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 6.11% 6.53%
Percentage of book of business 4.00% 4.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2004 and prior    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 2.95% 3.06%
Percentage of book of business 5.00% 5.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2005-2008    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 7.18% 7.60%
Percentage of book of business 10.00% 10.00%
Guaranty Book of Business [Member] | Conventional Loan [Member] | 2009-2016    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Seriously delinquent (percentage of conventional loans) 0.35% 0.36%
Percentage of book of business 85.00% 85.00%
Minimum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 90 days 90 days