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Concentrations of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2021
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,
2021202020212020
Midwest14 %14 %11 %11 %
Northeast16 17 15 15 
Southeast23 22 27 27 
Southwest18 19 22 22 
West29 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  
Concentration Risk [Line Items]  
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 10% or more 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,
20212020
Wells Fargo Bank, N.A. (together with its affiliates)10 %13 %
Remaining top five depository servicers11 11 
Top five non-depository servicers23 24 
Total44 %48 %
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.
As of December 31,
20212020
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 UPB0.73 %0.16 %1.20 %0.88 %0.33 %3.10 %
Percentage of single-family conventional loans based on loan count0.86 0.20 1.25 1.02 0.36 2.87 
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, 2021 and 2020
Schedule of Risk Characteristics Guaranty Book of Business
As of December 31,
20212020
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:
80.01% to 90%5 %0.88 %9 %4.17 %
90.01% to 100%2 0.51 4 1.85 
Greater than 100%*12.41 *22.43 
Geographical distribution:
California19 1.01 19 2.62 
Florida6 1.59 6 4.17 
Illinois3 1.55 3 3.10 
New Jersey3 1.90 3 4.57 
New York5 2.24 5 4.79 
All other states64 1.16 64 2.59 
Product distribution:
Alt-A1 4.96 1 9.32 
Vintages:
2004 and prior1 3.48 2 5.88 
2005-20082 5.87 2 9.98 
2009-202197 1.01 96 2.39 
* 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, 2021 and 2020.
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,
20212020
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$176,587 $170,890 
Pool mortgage insurance261 291 
Total mortgage insurance risk in force$176,848 5 %$171,181 5 %
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,
20212020
Counterparty:(1)
Arch Capital Group Ltd.19 %21 %
Mortgage Guaranty Insurance Corp.19 18 
Radian Guaranty, Inc. 17 19 
Genworth Mortgage Insurance Corp.17 16 
Essent Guaranty, Inc.16 16 
National Mortgage Insurance Corp.11 9 
Others1 1 
Total100 %100 %
(1)Insurance coverage amounts provided for each counterparty may include coverage provided by affiliates and subsidiaries of the counterparty.
Multifamily  
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,
20212020
Walker & Dunlop, Inc.12 %12 %
Wells Fargo Bank, N.A. (together with its affiliates)11 12 
Remaining top five servicers24 24 
Total47 %48 %
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.
As of December 31,
2021(1)
 2020(1)
30 Days Delinquent
Seriously Delinquent(2)
30 Days Delinquent
Seriously Delinquent(2)
Percentage of multifamily guaranty book of business0.03 %0.42 %0.29 %0.98 %
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
As of December 31,
20212020
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 %0.13 %1 %1.04 %
Less than or equal to 80%99 0.42 99 0.98 
Current DSCR below 1.0(4)
2 13.90 2 21.19 
(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 from annual statements for these properties.