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Concentrations of Credit Risk (Tables)

3 Months Ended

Mar. 31, 2019

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
	March 31, 2019⁽¹⁾						December 31, 2018⁽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⁾	1.15	%	0.31	%	0.67	%	1.17	%	0.32	%	0.69	%
Percentage of single-family conventional loans⁽⁴⁾	1.32		0.35		0.74		1.37		0.38		0.76

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



	As of
	March 31, 2019⁽¹⁾			December 31, 2018⁽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%	*	9.35	%	*	9.85	%
Geographical distribution:
California	19	0.34		19	0.34
Florida	6	1.03		6	1.16
New Jersey	3	1.32		4	1.38
New York	5	1.38		5	1.40
All other states	67	0.72		66	0.75
Product distribution:
Alt-A	2	3.31		2	3.35
Vintages:
2004 and prior	3	2.68		3	2.69
2005-2008	4	4.50		5	4.61
2009-2019	93	0.33		92	0.34


*	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 approximately 99% of our single-family conventional guaranty book of business as of March 31, 2019 and December 31, 2018.


⁽²⁾	Consists of single-family conventional loans that were 90 days or more past due or in the foreclosure process as of March 31, 2019 and December 31, 2018.


⁽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
	March 31, 2019			December 31, 2018
	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	$	154,823		$	152,379
Pool mortgage insurance	400			409
Total mortgage insurance risk in force	$	155,223	5%	$	152,788	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 mortgage loans in our single-family guaranty book of business.



	Percentage of Risk in Force Coverage by Mortgage Insurer
	As of
	March 31, 2019		December 31, 2018
Counterparty:⁽¹⁾
Arch Capital Group Ltd.	24	%	25	%
Radian Guaranty, Inc.	21		21
Mortgage Guaranty Insurance Corp.	18		18
Genworth Mortgage Insurance Corp.⁽²⁾	15		15
Essent Guaranty, Inc.	12		12
Others	10		9
Total	100	%	100	%

⁽¹⁾

Insurance coverage amounts provided for each counterparty may include coverage provided by affiliates and subsidiaries of the counterparty.

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
	March 31, 2019		December 31, 2018
Wells Fargo Bank, N.A. (together with its affiliates)	18	%	18	%
Remaining top five depository servicers	15		16
Top five non-depository servicers	25		22
Total	58	%	56	%

Multifamily [Member]

Concentration Risk [Line Items]

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



	As of
	March 31, 2019 ⁽¹⁾			December 31, 2018⁽¹⁾
	30 Days Delinquent	Seriously Delinquent⁽²⁾		30 Days Delinquent		Seriously Delinquent⁽²⁾
Percentage of multifamily guaranty book of business	*	0.07	%	0.02	%	0.06	%

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



	As of
	March 31, 2019				December 31, 2018
	Percentage of Multifamily Guaranty Book of Business⁽¹⁾		Percentage Seriously Delinquent⁽²⁾⁽³⁾		Percentage of Multifamily Guaranty Book of Business⁽¹⁾		Percentage Seriously Delinquent⁽²⁾⁽³⁾
Original LTV ratio:
Greater than 80%	1	%	—	%	1	%	—	%
Less than or equal to 80%	99		0.07		99		0.06
Current DSCR below 1.0⁽⁴⁾	2		0.62		2		1.38


*	Represents less than 0.005% of multifamily loans that were 30 days delinquent.


⁽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.

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
	March 31, 2019		December 31, 2018
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	%