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Concentrations of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2018
Geographic Concentration Risk [Member]  
Concentration Risk [Line Items]  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] 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 Business(2)
 
Percentage of Multifamily Guaranty Book of Business(3)
 
As of December 31,
 
As of December 31,
 
2018
 
2017
 
2018
 
2017
Midwest
 
15
%
 
 
15
%
 
 
10
%
 
 
9
%
Northeast
 
17
 
 
 
18
 
 
 
14
 
 
 
15
 
Southeast
 
22
 
 
 
22
 
 
 
26
 
 
 
26
 
Southwest
 
18
 
 
 
17
 
 
 
24
 
 
 
23
 
West
 
28
 
 
 
28
 
 
 
26
 
 
 
27
 
Total
 
100
%
 
 
100
%
 
 
100
%
 
 
100
%
(1) 
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.
(2) 
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 single-family conventional guaranty book of business as of December 31, 2018 and 2017.
(3) 
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, 2018 and 2017.
Single-Family [Member]  
Concentration Risk [Line Items]  
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 guaranty book of business.
 
 
As of
 
 
December 31, 2018
 
December 31, 2017
 
 
Risk in Force
 
Percentage of Single-Family Guaranty Book of Business
 
Risk in Force
 
Percentage of Single-Family Guaranty Book of Business
 
 
(Dollars in millions)
Mortgage insurance risk in force:
 
 
 
 
 
 
 
 
Primary mortgage insurance
 
$
152,379

 
 
 
$
137,941

 
 
Pool mortgage insurance
 
409

 
 
 
519

 
 
Total mortgage insurance risk in force
 
$
152,788

 
5%
 
$
138,460

 
5%
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, 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, 2018
 
December 31, 2017
Wells Fargo Bank, N.A. (together with its affiliates)
 
18
%
 
18
%
Remaining top five depository servicers
 
16

 
17

Top five non-depository servicers
 
22

 
20

Total
 
56
%
 
55
%
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 and total multifamily guaranty book of business.
 
As of December 31,
 
2018(1)
 
2017(1)
 
30 Days Delinquent
 
60 Days Delinquent
 
Seriously Delinquent(2)
 
30 Days Delinquent
 
60 Days Delinquent
 
Seriously Delinquent(2)
Percentage of single-family conventional guaranty book of business(3)
1.17
%
 
0.32
%
 
0.69
%
 
1.42
%
 
0.43
%
 
1.15
%
Percentage of single-family conventional loans(4)
1.37

 
0.38

 
0.76

 
1.63

 
0.50

 
1.24
Schedule of Risk Characteristics Guaranty Book of Business [Table Text Block]
 
As of December 31,
 
2018(1)
 
2017(1)
 
Percentage of
Single-Family
Conventional
Guaranty Book of Business(3)
 
Seriously Delinquent
Rate(2)
 
Percentage of
Single-Family
Conventional
Guaranty Book of Business(3)
 
Seriously Delinquent
Rate(2)
Estimated mark-to-market LTV ratio:
 
 
 
 
 
 
 
Greater than 100%
*
 
9.85
%
 
1
%
 
11.70
%
Geographical distribution:
 
 
 
 
 
 
 
California
19
 
0.34

 
19

 
0.42

Florida
6
 
1.16

 
6

 
3.71

New Jersey
4
 
1.38

 
4

 
2.15

New York
5
 
1.40

 
5

 
2.02

All other states
66
 
0.75

 
66

 
1.09

Product distribution:
 
 
 
 
 
 
 
Alt-A
2
 
3.35

 
2

 
4.95

Vintages:
 
 
 
 
 
 
 
2004 and prior
3
 
2.69

 
4

 
3.28

2005-2008
5
 
4.61

 
6

 
6.55

2009-2018
92
 
0.34

 
90

 
0.53

 
*
Represents less than 0.5% of single-family conventional business volume or book of business.
(1) 
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 single-family conventional guaranty book of business as of December 31, 2018 and 2017.  
(2) 
Consists of single-family conventional loans that were 90 days or more past due or in the foreclosure process as of December 31, 2018 and 2017.
(3) 
Calculated based on the aggregate unpaid principal balance of single-family conventional loans for each category divided by the aggregate unpaid principal balance of loans in our single-family conventional guaranty book of business.  
(4) 
Calculated based on the number of single-family conventional loans that were delinquent divided by the total number of loans in our single-family conventional guaranty book of business.
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 the single-family loans in our guaranty book of business.
 
 
Percentage of Total Risk in Force Mortgage Insurance Coverage
 
 
As of
 
 
December 31, 2018
 
December 31, 2017
Counterparty:(1)
 
 
Arch Capital Group Ltd.
 
25
%
 
25
%
Radian Guaranty, Inc.
 
21

 
21

Mortgage Guaranty Insurance Corp.
 
18

 
19

Genworth Mortgage Insurance Corp.(2)
 
15

 
15

Essent Guaranty, Inc.
 
12

 
11

Others
 
9

 
9

Total
 
100
%
 
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. We have approved the acquisition subject to specified conditions, including Genworth Financial, Inc. receiving all required and outstanding regulatory approvals. Upon acquisition, Genworth Mortgage Insurance Corp. will continue to be subject to our ongoing review of financial and operational eligibility requirements.
Multifamily [Member]  
Concentration Risk [Line Items]  
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
 
 
December 31, 2018
 
December 31, 2017
Wells Fargo Bank, N.A. (together with its affiliates)
 
14
%
 
14
%
Walker & Dunlop, LLC
 
12

 
12

Remaining top five servicers
 
22

 
22

Total
 
48
%
 
48
%
Schedule of Delinquency Status Guaranty Book of Business [Table Text Block]
 
As of December 31,
 
2018(1)(2)
 
 2017(1)(2)
 
30 Days Delinquent
 
Seriously Delinquent(3)
 
30 Days Delinquent
 
Seriously Delinquent(3)
Percentage of multifamily guaranty book of business
0.02
%
 
0.06
%
 
0.03
%
 
0.11
%
Schedule of Risk Characteristics Guaranty Book of Business [Table Text Block]
 
As of December 31,
 
2018(1)
 
2017(1)
 
Percentage of Multifamily Guaranty Book of Business(2)
 
Percentage Seriously Delinquent(3)(4)
 
Percentage of Multifamily Guaranty Book of Business(2)
 
Percentage Seriously Delinquent(3)(4)
Original LTV ratio:
 
 
 
 
 
 
 
Greater than 80%
1
%
 
—
%
 
2
%
 
0.21
%
Less than or equal to 80%
99

 
0.06

 
98

 
0.11

Current DSCR less than 1.0(5)
2

 
1.38

 
2

 
1.96

(1) 
Consists of the portion of our multifamily guaranty book of business for which we have detailed loan level information, which constituted approximately 99% of our total multifamily guaranty book of business as of December 31, 2018 and 2017, excluding loans that have been defeased.
(2) 
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.
(3) 
Consists of multifamily loans that were 60 days or more past due as of the dates indicated.
(4) 
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.
(5) 
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.