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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables that Subsequently Defaulted (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans			$ 941,410		$ 1,020,863	$ 373,683
Threshold period for payment default			60 days
60 Days or Greater Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans	$ 87,722	$ 14,546	$ 121,032	$ 26,449
Payment Default	86,969	14,129	123,127	27,672
Charge-Offs	18,056	4,534	20,564	6,428
Combination - Interest Rate Reduction and Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans	83,100	12,400	115,400	23,000
Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans	4,600	2,100	5,700	3,400
Private Education Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans			966,356		$ 1,049,190	$ 380,526
Private Education Loans | 60 Days or Greater Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans	87,722	14,546	121,032	26,449
Payment Default	86,969	14,129	123,127	27,672
Charge-Offs	$ 18,056	$ 4,534	$ 20,564	$ 6,428

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