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Concentrations of Credit Risk (Tables)
 9 Months Ended
Sep. 30, 2020
Single-family [Member]  
Concentration Risk [Line Items]  
Schedule of Delinquency Status Guaranty Book of Business [Table Text Block]
The following tables display the delinquency status and serious delinquency rates for specified loan categories of our single-family conventional guaranty book of business.
As of
September 30, 2020
December 31, 2019
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
1.00 %0.49 %3.61 %1.07 %0.29 %0.59 %
Percentage of single-family conventional loans based on loan count
1.11 0.50 3.20 1.27 0.35 0.66 
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 September 30, 2020 or December 31, 2019
Schedule of Risk Characteristics Guaranty Book of Business [Table Text Block]
As of
September 30, 2020
December 31, 2019
Percentage of
Single-Family
Conventional
Guaranty Book of Business
Based on UPB
Serious Delinquency Rate(1)
Percentage of
Single-Family
Conventional
Guaranty Book of Business
Based on UPB
Serious Delinquency Rate(1)
Estimated mark-to-market LTV ratio:
Greater than 100%*21.74 %*10.14 %
Geographical distribution:
California19 %3.04 19 %0.32 
Florida6 4.76 6 0.84 
Illinois3 3.46 4 0.91 
New Jersey3 5.31 3 1.13 
New York5 5.39 5 1.18 
All other states64 2.85 63 0.64 
Product distribution:
Alt-A1 9.46 2 2.95 
Vintages:
2004 and prior2 5.81 2 2.48 
2005-20083 9.84 4 4.11 
2009-202095 2.74 94 0.35 
*    Represents less than 0.5% of single-family conventional guaranty 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 September 30, 2020 or December 31, 2019.
Schedule of Risk in Force Mortgage Insurance Coverage [Table Text Block]
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
September 30, 2020December 31, 2019
Risk in ForcePercentage of Single-Family Guaranty Book of BusinessRisk in ForcePercentage of Single-Family Guaranty Book of Business
(Dollars in millions)
Mortgage insurance risk in force:
Primary mortgage insurance$169,011 $162,855 
Pool mortgage insurance296 339 
Total mortgage insurance risk in force$169,307 5%$163,194 6%
Schedule of Risk in Force Mortgage Insurance Coverage, by Counterparty [Table Text Block]
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
September 30, 2020December 31, 2019
Counterparty:(1)
Arch Capital Group Ltd.21 %23 %
Radian Guaranty, Inc.19 20 
Mortgage Guaranty Insurance Corp.18 18 
Genworth Mortgage Insurance Corp.(2)
17 15 
Essent Guaranty, Inc.15 14 
Others10 10 
Total100 %100 %
(1)Insurance coverage amounts provided for each counterparty may include coverage provided by affiliates and subsidiaries of the counterparty.
(2)Genworth Financial, Inc., the ultimate parent company of Genworth Mortgage Insurance Corp., is in the process of being acquired by China Oceanwide Holdings Group Co., Ltd. Upon acquisition, Genworth Mortgage Insurance Corp. will continue to be subject to our ongoing review of financial and operational eligibility requirements.
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] 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
September 30, 2020December 31, 2019
Wells Fargo Bank, N.A. (together with its affiliates)15 %17 %
Remaining top five depository servicers12 15 
Top five non-depository servicers25 27 
Total52 %59 %
Multifamily [Member]  
Concentration Risk [Line Items]  
Schedule of Delinquency Status Guaranty Book of Business [Table Text Block]
The following tables display the delinquency status and serious delinquency rates for specified loan categories of our multifamily guaranty book of business.
As of
September 30, 2020(1)
December 31, 2019(1)
30 Days Delinquent
Seriously Delinquent(2)
30 Days Delinquent
Seriously Delinquent(2)
Percentage of multifamily guaranty book of business0.14 %1.12 %0.02 %0.04 %
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.
Schedule of Risk Characteristics Guaranty Book of Business [Table Text Block]
As of
September 30, 2020December 31, 2019
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 %1.24 %1 %— %
Less than or equal to 80%99 1.12 99 0.04 
Current DSCR below 1.0(4)
2 22.07 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 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. As a result, the financial information we have received from borrowers to date may only reflect the initial impact of COVID-19. For certain properties, we do not receive updated financial information.
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
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
September 30, 2020December 31, 2019
Wells Fargo Bank, N.A. (together with its affiliates)13 %13 %
Walker & Dunlop, Inc.12 12 
Remaining top five servicers23 23 
Total48 %48 %