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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Valuation of financial instruments that are marked-to-market on recurring basis
The following table summarizes the valuation of our financial instruments that are marked-to-fair value on a recurring basis.
 
 Fair Value Measurements on a Recurring Basis
 December 31, 2020December 31, 2019
Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total 
Assets
Trading investments$— $— $16,923 $16,923 $— $— $— $— 
Available-for-sale investments— 1,996,634 — 1,996,634 — 487,669 — 487,669 
Derivative instruments— 729 — 729 — 715 — 715 
Total$— $1,997,363 $16,923 $2,014,286 $— $488,384 $— $488,384 
Liabilities
Derivative instruments$— $(287)$— $(287)$— $(1,164)$— $(1,164)
Total$— $(287)$— $(287)$— $(1,164)$— $(1,164)
Fair values of financial assets and liabilities, including derivative financial instruments
The following table summarizes the fair values of our financial assets and liabilities, including derivative financial instruments.

 December 31, 2020December 31, 2019
Fair
Value
Carrying
Value
DifferenceFair
Value
Carrying
Value
Difference
Earning assets:
Loans held for investment, net:
   Private Education Loans$22,124,171 $18,436,968 $3,687,203 $24,988,941 $22,896,515 $2,092,426 
   FFELP Loans748,657 735,208 13,449 795,055 783,816 11,239 
   Personal Loans— — — 1,047,119 983,643 63,476 
Credit Cards12,249 10,967 1,282 3,818 3,818 — 
Loans held for sale3,226,029 2,885,640 340,389 — — — 
Cash and cash equivalents4,455,292 4,455,292 — 5,563,877 5,563,877 — 
Trading investments16,923 16,923 — — — — 
Available-for-sale investments1,996,634 1,996,634 — 487,669 487,669 — 
Accrued interest receivable1,527,816 1,387,305 140,511 1,491,471 1,392,725 98,746 
Tax indemnification receivable18,492 18,492 — 27,558 27,558 — 
Derivative instruments729 729 — 715 715 — 
Total earning assets$34,126,992 $29,944,158 $4,182,834 $34,406,223 $32,140,336 $2,265,887 
Interest-bearing liabilities:
Money-market and savings accounts$11,136,560 $11,067,633 $(68,927)$10,363,691 $10,335,163 $(28,528)
Certificates of deposit11,799,223 11,597,266 (201,957)14,065,007 13,947,743 (117,264)
Short-term borrowings— — — 289,230 289,230 — 
Long-term borrowings5,398,309 5,189,217 (209,092)4,434,323 4,354,037 (80,286)
Accrued interest payable60,272 60,272 — 75,158 75,158 — 
Derivative instruments287 287 — 1,164 1,164 — 
Total interest-bearing liabilities$28,394,651 $27,914,675 $(479,976)$29,228,573 $29,002,495 $(226,078)
Excess of net asset fair value over carrying value$3,702,858 $2,039,809