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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Loan reserves $ 362,368 $ 300,538
Net unrealized losses 30,160 0
Accrued expenses not currently deductible 12,949 14,307
Unrecorded tax benefits 12,916 11,016
Research and development costs 10,929 0
Stock-based compensation plans 9,624 10,174
Operating loss carryovers 300 394
Other 4,618 2,415
Total deferred tax assets 443,864 338,844
Deferred tax liabilities:    
Student loan premiums and discounts, net 14,065 12,396
Fixed assets 9,347 10,131
Federal deferred for state receivable 2,111 1,921
Research and development costs 0 8,710
Net unrealized gains 0 6,459
Other 397 396
Total deferred tax liabilities 25,920 40,013
Net deferred tax assets $ 417,944 $ 298,831