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Concentrations of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2017
 
2016
Midwest
 
15
%
 
 
15
%
 
 
9
%
 
 
9
%
Northeast
 
18
 
 
 
18
 
 
 
15
 
 
 
16
 
Southeast
 
22
 
 
 
22
 
 
 
26
 
 
 
25
 
Southwest
 
17
 
 
 
17
 
 
 
23
 
 
 
22
 
West
 
28
 
 
 
28
 
 
 
27
 
 
 
28
 
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 total single-family conventional guaranty book of business as of December 31, 2017 and 2016.
(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, 2017 and 2016.
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 and total multifamily guaranty book of business.
 
As of December 31,
 
2017(1)
 
2016(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)
1.42
%
 
0.43
%
 
1.15
%
 
1.30
%
 
0.36
%
 
1.18
%
Percentage of single-family conventional loans(4)
1.63

 
0.50

 
1.24

 
1.51

 
0.41

 
1.20

Schedule of Risk Characteristics Guaranty Book of Business [Table Text Block]
 
As of December 31,
 
2017(1)
 
2016(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
%
 
11.70
%
 
2
%
 
10.44
%
Geographical distribution:
 
 
 
 
 
 
 
California
19

 
0.42

 
19

 
0.50

Florida
6

 
3.71

 
6

 
1.89

New Jersey
4

 
2.15

 
4

 
3.07

New York
5

 
2.02

 
5

 
2.65

All other states
66

 
1.09

 
66

 
1.11

Product distribution:
 
 
 
 
 
 
 
Alt-A
2

 
4.95

 
3

 
5.00

Vintages:
 
 
 
 
 
 
 
2004 and prior
4

 
3.28

 
5

 
2.82

2005-2008
6

 
6.55

 
8

 
6.39

2009-2017
90

 
0.53

 
87

 
0.36

__________  
(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 December 31, 2017 and 2016.  
(2) 
Consists of single-family conventional loans that were 90 days or more past due or in the foreclosure process as of December 31, 2017 and 2016.
(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.
Multifamily [Member]  
Concentration Risk [Line Items]  
Schedule of Delinquency Status Guaranty Book of Business [Table Text Block]
 
As of December 31,
 
2017(1)(2)
 
 2016(1)(2)
 
30 Days Delinquent
 
Seriously Delinquent(3)
 
30 Days Delinquent
 
Seriously Delinquent(3)
Percentage of multifamily guaranty book of business
0.03
%
 
0.11
%
 
0.02
%
 
0.05
%
Schedule of Risk Characteristics Guaranty Book of Business [Table Text Block]
 
As of December 31,
 
2017(1)
 
2016(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%
2
%
 
0.21
%
 
2
%
 
0.22
%
Less than or equal to 80%
98

 
0.11

 
98

 
0.05

Current DSCR less than 1.0(5)
2

 
1.96

 
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, 2017 and 2016, 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.