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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables that Subsequently Defaulted (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans			$ 190,877		$ 326,116
60 Days or Greater Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans	$ 12,360	$ 3,512	19,374	$ 3,963
Payment Default	12,099	3,450	20,304	3,901
Charge-Offs	3,348	74	5,279	74
Combination - Interest Rate Reduction and Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans	11,000	3,300	17,000	3,700
Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans	1,400	200	2,400	300
Private Education Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans			190,877		$ 326,116
Private Education Loans \| 60 Days or Greater Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified Loans	12,360	3,512	19,374	3,963
Payment Default	12,099	3,450	20,304	3,901
Charge-Offs	$ 3,348	$ 74	$ 5,279	$ 74