Concentrations of Credit Risk (Tables)

6 Months Ended

Jun. 30, 2018

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
	June 30, 2018⁽¹⁾						December 31, 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⁾	1.14	%	0.29	%	0.90	%	1.42	%	0.43	%	1.15	%
Percentage of single-family conventional loans⁽⁴⁾	1.34		0.34		0.97		1.63		0.50		1.24

Schedule of Risk Characteristics Guaranty Book of Business [Table Text Block]



	As of
	June 30, 2018⁽¹⁾				December 31, 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 loan-to-value ratio:
Greater than 100%	1	%	11.41	%	1	%	11.70	%
Geographical distribution:
California	19		0.36		19		0.42
Florida	6		2.51		6		3.71
New Jersey	4		1.68		4		2.15
New York	5		1.66		5		2.02
All other states	66		0.88		66		1.09
Product distribution:
Alt-A	2		4.21		2		4.95
Vintages:
2004 and prior	3		3.00		4		3.28
2005-2008	6		5.54		6		6.55
2009-2018	91		0.41		90		0.53

__________


⁽¹⁾	Consists of the portion of our single-family conventional guaranty book of business for which we have detailed loan level information, which constituted approximately 99% of our total single-family conventional guaranty book of business as of June 30, 2018 and December 31, 2017.


⁽²⁾	Consists of single-family conventional loans that were 90 days or more past due or in the foreclosure process as of June 30, 2018 and December 31, 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 [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
	June 30, 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	$	144,023		$	137,941
Pool mortgage insurance	432			519
Total mortgage insurance risk in force	$	144,455	5%	$	138,460	5%

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
	June 30, 2018		December 31, 2017
Counterparty:⁽¹⁾
Arch Capital Group Ltd.⁽²⁾	25	%	25	%
Radian Guaranty, Inc.	21		21
Mortgage Guaranty Insurance Corp.	19		19
Genworth Mortgage Insurance Corp.	15		15
Essent Guaranty, Inc.	11		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⁾	Arch Capital Group Ltd. is the parent company of Arch Mortgage Insurance Co. and United Guaranty Residential Insurance Co.

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.



	Percentage of Single-Family Guaranty Book of Business
	As of
	June 30, 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	21		20
Total	55	%	55	%

Multifamily [Member]

Concentration Risk [Line Items]

Schedule of Delinquency Status Guaranty Book of Business [Table Text Block]



	As of
	June 30, 2018 ⁽¹⁾⁽²⁾				December 31, 2017⁽¹⁾⁽²⁾
	30 Days Delinquent		Seriously Delinquent⁽³⁾		30 Days Delinquent		Seriously Delinquent⁽³⁾
Percentage of multifamily guaranty book of business	0.01	%	0.10	%	0.03	%	0.11	%

Schedule of Risk Characteristics Guaranty Book of Business [Table Text Block]



	As of
	June 30, 2018				December 31, 2017
	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	%	0.19	%	2	%	0.21	%
Less than or equal to 80%	99		0.10		98		0.11
Current DSCR less than 1.0⁽⁵⁾	2		3.25		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 June 30, 2018 and December 31, 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 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.

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.



	Percentage of Multifamily Guaranty Book of Business
	As of
	June 30, 2018		December 31, 2017
Wells Fargo Bank, N.A. (together with its affiliates)	14	%	14	%
Walker & Dunlop, LLC	11		12
Remaining top five servicers	23		22
Total	48	%	48	%