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DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS (Tables)
3 Months Ended
Mar. 31, 2016
DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS [Abstract]  
Financial Instruments Other than Debt Securities
Fair value-related disclosures for financial instruments other than debt securities were as follows as of the indicated dates (in thousands):

  
March 31, 2016
  
December 31, 2015
 
  
Carrying
Amount
  
Fair
Value
  
Carrying
Amount
  
Fair
Value
 
 
Financial assets:
            
Residential mortgage loans
 
$
3,190
  
$
3,200
  
$
3,817
  
$
3,900
 
Lending counterparty investments
  
35,002
   
35,002
   
65,002
   
65,002
 
Portfolio-related interest rate swap agreements
  
802
   
802
   
7,720
   
7,720
 
Financial liabilities:
                
Secured borrowings with initial terms of greater than 120 days
  
2,243,179
   
2,243,800
   
3,246,177
   
3,245,000
 
Unsecured borrowings
  
98,014
   
73,100
   
97,986
   
77,200
 
Interest rate swap agreements:
                
Portfolio-related
  
11,296
   
11,296
   
1,051
   
1,051
 
Unsecured borrowings-related
  
35,013
   
35,013
   
25,010
   
25,010
 
Fair Value and Related Disclosures for Debt Securities
Fair value-related disclosures for debt securities were as follows as of the indicated dates (in thousands):

  
Amortized
  
Gross Unrealized
    
  
Cost Basis
  
Gains
  
Losses
  
Fair Value
 
March 31, 2016
            
Agency Securities classified as available-for-sale:
            
Fannie Mae/Freddie Mac
 
$
10,126,512
  
$
161,157
  
$
2,487
  
$
10,285,182
 
Ginnie Mae
  
3,535,993
   
15,295
   
6,953
   
3,544,335
 
Residential mortgage securities classified as held-to-maturity
  
2,425
   
31
   
   
2,456
 
December 31, 2015
                
Agency Securities classified as available-for-sale:
                
Fannie Mae/Freddie Mac
  
10,331,965
   
166,794
   
10,954
   
10,487,805
 
Ginnie Mae
  
3,661,766
   
11,705
   
13,016
   
3,660,455
 
Residential mortgage securities classified as held-to-maturity
  
2,660
   
44
   
   
2,704
 
Securities in Unrealized Loss Position
  
March 31, 2016
  December 31, 2015 
  
Fair
Value
  
Unrealized
Loss
  
Fair
Value
  
Unrealized
Loss
 
Securities in an unrealized loss position:
            
One year or greater
 
$
590,795
  
$
3,779
  
$
597,652
  
$
4,259
 
Less than one year
  
1,818,868
   
5,661
   
4,468,844
   
19,711
 
  
$
2,409,663
  
$
9,440
  
$
5,066,496
  
$
23,970