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Borrowings (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Secured borrowings
The following table summarizes our secured borrowings at December 31, 2017 and 2016.

 
 
December 31, 2017
 
December 31, 2016
 
 
Short-Term
 
Long-Term
 
Total
 
Short-Term
 
Long-Term
 
Total
Unsecured borrowings:
 
 
 
 
 
 
 
 
 
 
 
 
Unsecured debt
 
$

 
$
196,539

 
$
196,539

 
$

 
$

 
$

Total unsecured borrowings
 

 
196,539

 
196,539

 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
Secured borrowings:
 
 
 
 
 
 
 
 
 
 
 
 
Private Education Loan term securitizations
 

 
3,078,731

 
3,078,731

 

 
2,167,979

 
2,167,979

ABCP Facility
 

 

 

 

 

 

Total secured borrowings
 

 
3,078,731

 
3,078,731

 

 
2,167,979

 
2,167,979

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
$

 
$
3,275,270

 
$
3,275,270

 
$

 
$
2,167,979

 
$
2,167,979

Short-term borrowings
The following table summarizes the outstanding short-term borrowings, the weighted average interest rates at the end of the period and the related average balance and weighted average interest rates during the period. The ABCP Facility’s contractual maturity is two years from the date of inception or renewal (one-year revolving period plus a one-year amortization period); however, we classify advances under our ABCP Facility as short-term borrowings because it is our intention to repay those advances within one year. Rates reflect stated interest of borrowings and related discounts and premiums.


 
 
December 31, 2017
 
Year Ended
December 31, 2017
 
 
Ending Balance
 
Weighted Average
Interest Rate
 
Average Balance
 
Weighted Average
Interest Rate
Short-term borrowings:
 
 
 
 
 
 
 
 
ABCP Facility
 
$

 
%
 
$
81,370

 
6.09
%
Maximum outstanding at any month end
 
$
300,000

 
 
 
 
 
 


 
 
December 31, 2016
 
Year Ended
December 31, 2016
 
 
Ending Balance
 
Weighted Average
Interest Rate
 
Average Balance
 
Weighted Average
Interest Rate
Short-term borrowings:
 
 
 
 
 
 
 
 
ABCP Facility
 
$

 
%
 
$
229,719

 
2.61
%
Maximum outstanding at any month end
 
$
526,500

 
 
 
 
 
 
    
Long-term borrowings
The following table summarizes the outstanding long-term borrowings, the weighted average interest rates at the end of the period and the related average balance during the period. Rates reflect stated interest of borrowings and related discounts and premiums. The long-term borrowings amortize over time and mature serially from 2023 to 2040.

 
 
December 31, 2017
 
Year Ended
December 31, 2017
 
December 31, 2016
 
Year Ended
December 31, 2016
 
 
Ending Balance
 
Weighted Average
Interest Rate
 
Average Balance
 
Ending Balance
 
Weighted Average
Interest Rate
 
Average Balance
Floating rate borrowings
 
$
1,512,970

 
2.32
%
 
$
1,422,856

 
$
1,175,819

 
1.71
%
 
$
687,580

Fixed rate borrowings
 
1,762,300

 
3.04

 
1,420,737

 
992,160

 
2.68

 
548,465

Total long-term borrowings
 
$
3,275,270

 
2.71
%
 
$
2,843,593

 
$
2,167,979

 
2.15
%
 
$
1,236,045


Secured financing
Secured Financings
Issue
 
Date Issued
 
Total Issued
 
Weighted Average Cost of Funds(1)
 
Weighted Average Life
(in years)
 
 
 
 
 
 
 
 
 
Private Education:
 
 
 
 
 
 
2016-A
 
May 2016
 
$
501,000

 
1 month LIBOR plus 1.38%
 
4.01
2016-B
 
July 2016
 
607,000

 
1 month LIBOR plus 1.36%
 
4.01
2016-C
 
October 2016
 
674,000

 
1 month LIBOR plus 1.15%
 
4.27
Total notes issued in 2016
 
$
1,782,000

 
 
 
 
 
 
 
 
 
 
 
 
 
Total loans and accrued interest amount securitized at inception in 2016
 
$
2,107,042

 
 
 
 
 
 
 
 
 
 
 
 
 
2017-A
 
February 2017
 
$
772,000

 
1 month LIBOR plus 0.93%
 
4.27
2017-B
 
November 2017
 
676,000

 
I month LIBOR plus 0.80%
 
4.07

 

 

 

 

Total notes issued in 2017
 
$
1,448,000

 
 
 
 
 
 
 
 
 
 
 
 
 
Total loans and accrued interest amount securitized at inception in 2017
 
$
1,606,804

 
 
 
 
____________
(1) Represents LIBOR equivalent cost of funds for floating and fixed rate bonds, excluding issuance costs.

Schedule of variable interest entities
 
 
December 31, 2017
 
 
Debt Outstanding
 
Carrying Amount of Assets Securing Debt Outstanding
 
 
Short-Term
 
Long-Term
 
Total
 
Loans
 
Restricted Cash
 
Other Assets(1)
 
Total
Secured borrowings:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Private Education Loan term securitizations
 
$

 
$
3,078,731

 
$
3,078,731

 
$
3,691,024

 
$
95,966

 
$
240,208

 
$
4,027,198

ABCP Facility
 

 

 

 

 
1,017

 
161

 
1,178

Total
 
$

 
$
3,078,731

 
$
3,078,731

 
$
3,691,024

 
$
96,983

 
$
240,369

 
$
4,028,376

    
 
 
December 31, 2016
 
 
Debt Outstanding
 
Carrying Amount of Assets Securing Debt Outstanding
 
 
Short-Term
 
Long-Term
 
Total
 
Loans
 
Restricted Cash
 
Other Assets(1)
 
Total
Secured borrowings:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Private Education Loan term securitizations
 
$

 
$
2,167,979

 
$
2,167,979

 
$
2,562,156

 
$
44,617

 
$
160,783

 
$
2,767,556

ABCP Facility
 

 

 

 

 

 

 

Total
 
$

 
$
2,167,979

 
$
2,167,979

 
$
2,562,156

 
$
44,617

 
$
160,783

 
$
2,767,556

________
(1) Other assets primarily represent accrued interest receivable.