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Concentrations of Credit Risk Geographic Concentration (Details) (Guaranty Book of Business [Member])
Dec. 31, 2013
Dec. 31, 2012
Multifamily [Member]
   
Concentration Risk [Line Items]    
Percentage of loans with detailed loan level information 99.00% 99.00%
Percentage of book of business 100.00% [1],[2] 100.00% [1],[2]
Multifamily [Member] | Midwest [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 9.00% [1],[2] 8.00% [1],[2]
Multifamily [Member] | Northeast [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 20.00% [1],[2] 21.00% [1],[2]
Multifamily [Member] | Southeast [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 21.00% [1],[2] 21.00% [1],[2]
Multifamily [Member] | Southwest [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 19.00% [1],[2] 18.00% [1],[2]
Multifamily [Member] | West [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 31.00% [1],[2] 32.00% [1],[2]
Conventional Mortgage [Member] | Single-Family [Member]
   
Concentration Risk [Line Items]    
Percentage of loans with detailed loan level information 99.00% 99.00%
Percentage of book of business 100.00% [2],[3] 100.00% [2],[3]
Conventional Mortgage [Member] | Single-Family [Member] | Midwest [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 15.00% [2],[3] 15.00% [2],[3]
Conventional Mortgage [Member] | Single-Family [Member] | Northeast [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 19.00% [2],[3] 19.00% [2],[3]
Conventional Mortgage [Member] | Single-Family [Member] | Southeast [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 22.00% [2],[3] 23.00% [2],[3]
Conventional Mortgage [Member] | Single-Family [Member] | Southwest [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 16.00% [2],[3] 16.00% [2],[3]
Conventional Mortgage [Member] | Single-Family [Member] | West [Member]
   
Concentration Risk [Line Items]    
Percentage of book of business 28.00% [2],[3] 27.00% [2],[3]
Minimum [Member] | Conventional Mortgage [Member] | Single-Family [Member]
   
Concentration Risk [Line Items]    
Percentage of loans with detailed loan level information 99.00% 99.00%
[1] Consists of the portion of our multifamily guaranty book of business for which we have detailed loan level information, which constituted 99% of our total multifamily guaranty book of business as of December 31, 2013 and 2012.
[2] Midwest consists of IL, IN, IA, MI, MN, NE, ND, OH, SD, WI; Northeast consists of CT, DE, ME, MA, NH, NJ, NY, PA, PR, RI, VT, VI; Southeast consists of AL, DC, FL, GA, KY, MD, MS, NC, SC, TN, VA, WV; Southwest consists of AZ, AR, CO, KS, LA, MO, NM, OK, TX, UT; West consists of AK, CA, GU, HI, ID, MT, NV, OR, WA and WY.
[3] Consists of the portion of our single-family conventional guaranty book of business for which we have detailed loan level information, which constituted over 99% of our total single-family conventional guaranty book of business as of December 31, 2013 and 2012.