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Loans - Schedule of Changes in Loans Measured at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Securitization clean-up calls $ 60,240 $ 131,372 $ 335,739 $ 131,372
Instrument-Specific Credit Risk Instruments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Loss included in earnings from changes in instrument-specific credit risk 23,221 9,038 16,725 2,111
Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 7,002,885 4,472,604 5,952,972 4,859,068
Origination of loans 3,202,618 2,946,109 6,524,809 5,492,087
Principal payments (628,928) (484,977) (1,232,897) (994,874)
Sales of loans (1,726,368) (2,422,718) (3,613,808) (4,815,885)
Purchases 72,793 148,739 350,472 149,930
Change in accumulated interest 5,000 (539) 10,325 (4,010)
Change in fair value 31,382 26,130 (32,491) (968)
Ending balance 7,959,382 4,685,348 7,959,382 4,685,348
Purchase of previously sold loans from certain investors 7,290 15,185 7,290 15,185
Fair Value, Recurring | Student Loans | Student Loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 3,737,439 2,666,793 3,450,837 2,866,459
Origination of loans 398,722 859,497 1,382,526 1,864,182
Principal payments (167,049) (235,889) (394,164) (486,108)
Sales of loans (259,690) (610,941) (803,840) (1,547,101)
Purchases 5,274 44,779 121,707 44,850
Change in accumulated interest (139) (403) (389) (1,652)
Change in fair value (182) 15,657 (42,302) (1,137)
Ending balance 3,714,375 2,739,493 3,714,375 2,739,493
Fair Value, Recurring | Home Loans | Home Loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 146,658 231,903 212,709 179,689
Origination of loans 332,047 792,228 644,430 1,527,832
Principal payments (701) (1,280) (5,101) (2,759)
Sales of loans (342,780) (841,642) (708,150) (1,519,208)
Purchases 330 422 828 541
Change in accumulated interest (23) 17 (31) (18)
Change in fair value (269) 665 (9,423) (3,764)
Ending balance 135,262 182,313 135,262 182,313
Fair Value, Recurring | Personal Loans | Personal Loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 3,118,788 1,573,908 2,289,426 1,812,920
Origination of loans 2,471,849 1,294,384 4,497,853 2,100,073
Principal payments (461,178) (247,808) (833,632) (506,007)
Sales of loans (1,123,898) (970,135) (2,101,818) (1,749,576)
Purchases 67,189 103,538 227,937 104,539
Change in accumulated interest 5,162 (153) 10,745 (2,340)
Change in fair value 31,833 9,808 19,234 3,933
Ending balance $ 4,109,745 $ 1,763,542 $ 4,109,745 $ 1,763,542