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Concentrations of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2020
Concentration Risk [Line Items]  
Schedule of Delinquency Status Guaranty Book of Business The following tables display the delinquency status and serious delinquency rates for specified loan categories of our multifamily guaranty book of business. 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.(2)Consists of multifamily loans that were 60 days or more past due as of the dates indicated.
Geographic Concentration Risk [Member]  
Concentration Risk [Line Items]  
Schedules of Concentration of Risk, by Risk Factor
The following table displays the regional geographic concentration of single-family and multifamily loans in our guaranty book of business, measured by the unpaid principal balance of the loans.
Geographic Concentration(1)
Percentage of Single-Family Conventional Guaranty Book of BusinessPercentage of Multifamily Guaranty Book of Business
As of December 31,As of December 31,
2020201920202019
Midwest14 %15 %11 %10 %
Northeast17 17 15 15 
Southeast22 22 27 27 
Southwest19 18 22 23 
West28 28 25 25 
Total100 %100 %100 %100 %
(1)Midwest consists of IL, IN, IA, MI, MN, NE, ND, OH, SD and WI. Northeast consists of CT, DE, ME, MA, NH, NJ, NY, PA, PR, RI, VT and VI. Southeast consists of AL, DC, FL, GA, KY, MD, MS, NC, SC, TN, VA and WV. Southwest consists of AZ, AR, CO, KS, LA, MO, NM, OK, TX and UT. West consists of AK, CA, GU, HI, ID, MT, NV, OR, WA and WY.
Single-Family [Member]  
Concentration Risk [Line Items]  
Schedule of Risk in Force Mortgage Insurance Coverage
The following table displays our total mortgage insurance risk in force by primary and pool insurance, as well as the total risk-in-force mortgage insurance coverage as a percentage of the single-family conventional guaranty book of business.
As of December 31,
20202019
Risk in ForcePercentage of Single-Family Conventional Guaranty Book of BusinessRisk in ForcePercentage of Single-Family Conventional Guaranty Book of Business
(Dollars in millions)
Mortgage insurance risk in force:
Primary mortgage insurance$170,890 $162,855 
Pool mortgage insurance291 339 
Total mortgage insurance risk in force$171,181 5%$163,194 6%
Schedules of Concentration of Risk, by Risk Factor The table below displays the percentage of our single-family guaranty book of business serviced by our top five depository single-family mortgage servicers and top five non-depository single-family mortgage servicers (i.e., servicers that are not insured depository institutions), and identifies one servicer that serviced more than 10% of our single-family guaranty book of business based on unpaid principal balance.
Percentage of Single-Family
Guaranty Book of Business
As of December 31,
20202019
Wells Fargo Bank, N.A. (together with its affiliates)13 %17 %
Remaining top five depository servicers11 15 
Top five non-depository servicers24 27 
Total48 %59 %
Schedule of Delinquency Status Guaranty Book of Business
The following tables display the delinquency status and serious delinquency rates for specified loan categories of our single-family conventional guaranty book of business. The increase in loans classified as seriously delinquent as of December 31, 2020 compared with December 31, 2019 was primarily attributable to the economic dislocation caused by the COVID-19 pandemic.
As of December 31,
20202019
30 Days Delinquent60 Days Delinquent
Seriously Delinquent(1)
30 Days Delinquent60 Days Delinquent
Seriously Delinquent(1)
Percentage of single-family conventional guaranty book of business based on UPB
0.88 %0.33 %3.10 %1.07 %0.29 %0.59 %
Percentage of single-family conventional loans based on loan count
1.02 0.36 2.87 1.27 0.35 0.66 
Schedule of Risk Characteristics Guaranty Book of Business
As of December 31,
20202019
Percentage of
Single-Family
Conventional
Guaranty Book
of Business Based on UPB
Seriously Delinquent
Rate(1)
Percentage of
Single-Family
Conventional
Guaranty Book
of Business Based on UPB
Seriously Delinquent
Rate(1)
Estimated mark-to-market LTV ratio:
Greater than 100%*22.43 %*10.14 %
Geographical distribution:
California19 2.62 19 0.32 
Florida6 4.17 6 0.84 
Illinois3 3.10 4 0.91 
New Jersey3 4.57 3 1.13 
New York5 4.79 5 1.18 
All other states64 2.59 63 0.64 
Product distribution:
Alt-A1 9.32 2 2.95 
Vintages:
2004 and prior2 5.88 2 2.48 
2005-20082 9.98 4 4.11 
2009-202096 2.39 94 0.35 
* Represents less than 0.5% of single-family conventional book of business.
(1)Based on loan count, consists of single-family conventional loans that were 90 days or more past due or in the foreclosure process as of December 31, 2020 and 2019.
Schedule of Risk in Force Mortgage Insurance Coverage, by Counterparty
The table below displays our mortgage insurer counterparties that provided approximately 10% or more of the risk-in-force mortgage insurance coverage on mortgage loans in our single-family conventional guaranty book of business.
Percentage of Risk-in-Force Coverage by Mortgage Insurer
As of December 31,
20202019
Counterparty:(1)
Arch Capital Group Ltd.21 %23 %
Radian Guaranty, Inc.19 20 
Mortgage Guaranty Insurance Corp.18 18 
Genworth Mortgage Insurance Corp.16 15 
Essent Guaranty, Inc.16 14 
Others10 10 
Total100 %100 %
(1)Insurance coverage amounts provided for each counterparty may include coverage provided by affiliates and subsidiaries of the counterparty.
Multifamily [Member]  
Concentration Risk [Line Items]  
Schedules of Concentration of Risk, by Risk Factor
The table below displays the percentage of our multifamily guaranty book of business serviced by our top five multifamily mortgage servicers, and identifies two servicers that serviced 10% or more of our multifamily guaranty book of business based on unpaid principal balance.
Percentage of Multifamily
Guaranty Book of Business
As of December 31,
20202019
Wells Fargo Bank, N.A. (together with its affiliates)12 %13 %
Walker & Dunlop, LLC12 12 
Remaining top five servicers24 23 
Total48 %48 %
Schedule of Delinquency Status Guaranty Book of Business
As of December 31,
2020(1)
 2019(1)
30 Days Delinquent
Seriously Delinquent(2)
30 Days Delinquent
Seriously Delinquent(2)
Percentage of multifamily guaranty book of business0.29 %0.98 %0.02 %0.04 %
Schedule of Risk Characteristics Guaranty Book of Business
As of December 31,
20202019
Percentage of Multifamily Guaranty Book of Business(1)
Serious Delinquency Rate(2)(3)
Percentage of Multifamily Guaranty Book of Business(1)
Serious Delinquency Rate(2)(3)
Original LTV ratio:
Greater than 80%1 %1.04 %1 %— %
Less than or equal to 80%99 0.98 99 0.04 
Current DSCR below 1.0(4)
2 21.19 2 0.48 
(1)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.
(2)Consists of multifamily loans that were 60 days or more past due as of the dates indicated.
(3)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 multifamily guaranty book of business.
(4)Our estimates of current DSCRs are based on the latest available income information for these properties. Although we use the most recently available results from 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. For certain properties, we do not receive updated financial information.