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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Earning assets: |  |
Loans held for sale | $ 0 | $ 0
Trading investments | 51,342 | 55,903
Accrued interest receivable, difference | 62,539 | 35,015
Tax indemnification receivable | 337,177 | 380,058
Derivative instruments | 0 | 405
Total earning assets, difference | 2,664,209 | 2,088,881
Interest-bearing liabilities: |  |
Long-term borrowings, difference | 407,677 | 421,881
Derivative instruments | 1,815 | 0
Total interest-bearing liabilities, difference | 900,095 | 838,340
Excess of net asset fair value over carrying value | 3,564,304 | 2,927,221
Money-market and savings accounts |  |
Interest-bearing liabilities: |  |
Deposits, difference | 124,242 | 104,979
Certificates of deposit |  |
Interest-bearing liabilities: |  |
Deposits, difference | 368,176 | 311,480
Fair Value |  |
Earning assets: |  |
Loans held for sale | 26,202 | 29,448
Cash and cash equivalents | 3,716,379 | 4,616,117
Trading investments | 51,342 | 55,903
Available-for-sale investments | 2,311,062 | 2,342,089
Accrued interest receivable | 1,393,556 | 1,237,074
Tax indemnification receivable | 2,858 | 2,816
Derivative instruments | 0 | 972
Total earning assets | 31,190,632 | 29,965,153
Interest-bearing liabilities: |  |
Long-term borrowings | 5,106,299 | 4,813,233
Accrued interest payable | 91,943 | 71,586
Derivative instruments | 1,815 | 567
Total interest-bearing liabilities | 26,509,305 | 25,915,574
Fair Value | Money-market and savings accounts |  |
Interest-bearing liabilities: |  |
Deposits | 11,671,878 | 11,854,849
Fair Value | Certificates of deposit |  |
Interest-bearing liabilities: |  |
Deposits | 9,637,370 | 9,175,339
Carrying Value |  |
Earning assets: |  |
Loans held for sale | 26,202 | 29,448
Cash and cash equivalents | 3,716,379 | 4,616,117
Trading investments | 51,342 | 55,903
Available-for-sale investments | 2,311,062 | 2,342,089
Accrued interest receivable | 1,331,017 | 1,202,059
Tax indemnification receivable | 2,858 | 2,816
Derivative instruments | 0 | 972
Total earning assets | 28,526,423 | 27,876,272
Interest-bearing liabilities: |  |
Long-term borrowings | 5,513,976 | 5,235,114
Accrued interest payable | 91,943 | 71,586
Derivative instruments | 1,815 | 567
Total interest-bearing liabilities | 27,409,400 | 26,753,914
Carrying Value | Money-market and savings accounts |  |
Interest-bearing liabilities: |  |
Deposits | 11,796,120 | 11,959,828
Carrying Value | Certificates of deposit |  |
Interest-bearing liabilities: |  |
Deposits | 10,005,546 | 9,486,819
Private Education Loans |  |
Earning assets: |  |
Loans held for investment, net, difference | 2,590,355 | 2,042,835
Private Education Loans | Fair Value |  |
Earning assets: |  |
Loans held for investment, net | 23,088,030 | 21,062,548
Private Education Loans | Carrying Value |  |
Earning assets: |  |
Loans held for investment, net | 20,497,675 | 19,019,713
FFELP Loans |  |
Earning assets: |  |
Loans held for investment, net, difference | 11,315 | 11,031
FFELP Loans | Fair Value |  |
Earning assets: |  |
Loans held for investment, net | 601,203 | 618,186
FFELP Loans | Carrying Value |  |
Earning assets: |  |
Loans held for investment, net | $ 589,888 | $ 607,155

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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