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Allowance for Credit Losses - Allowance and Recorded Investments in Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Allowance for Credit Losses          
Beginning balance $ 1,081,066 $ 1,160,244 $ 1,165,335 $ 1,361,723 $ 1,361,723
Transfer from unfunded commitment liability 168,377 110,613 303,591 262,049  
Provision for current period 97,550 (6,530) 171,218 (260,335)  
Loan sale reduction to provision (50,226) 0 (171,325) (10,335)  
Loans transferred to held-for-sale (2,372)   (2,372)    
Loans transferred from held-for-sale       1,887  
Total provisions 44,952 (6,530) (2,479) (268,783)  
Net charge-offs:          
Charge-offs (111,559) (56,225) (302,624) (161,569)  
Recoveries 11,402 7,305 30,415 21,987  
Net charge-offs (100,157) (48,920) (272,209) (139,582)  
Ending Balance 1,194,238 1,215,407 1,194,238 1,215,407 1,165,335
Allowance          
Ending balance: individually evaluated for impairment 0 69,626 0 69,626  
Ending balance: collectively evaluated for impairment 1,194,238 1,145,781 1,194,238 1,145,781  
Loans:          
Ending balance: individually evaluated for impairment 0 1,148,282 0 1,148,282  
Ending balance: collectively evaluated for impairment 20,748,077 21,278,012 20,748,077 21,278,012  
Private Education Loan provision for credit losses, other impacts (304) 465 373 588  
Less: provisions for credit losses 207,598 138,442 336,193 (17,648)  
FFELP Loans          
Allowance for Credit Losses          
Beginning balance 3,929 4,262 4,077 4,378 4,378
Transfer from unfunded commitment liability 0 0 0 0  
Provision for current period 29 50 110 77  
Loan sale reduction to provision 0 0 0 0  
Loans transferred to held-for-sale 0   0    
Loans transferred from held-for-sale       0  
Total provisions 29 50 110 77  
Net charge-offs:          
Charge-offs (147) (106) (376) (249)  
Recoveries 0 0 0 0  
Net charge-offs (147) (106) (376) (249)  
Ending Balance 3,811 4,206 3,811 4,206 4,077
Allowance          
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 3,811 4,206 3,811 4,206  
Loans:          
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment $ 643,614 $ 705,691 $ 643,614 $ 705,691  
Net charge-offs as a percentage of average loans in repayment (annualized) 0.11% 0.08% 0.09% 0.06%  
Allowance as a percentage of the ending total loan balance 0.59% 0.60% 0.59% 0.60%  
Allowance as a percentage of the ending loans in repayment 0.78% 0.79% 0.78% 0.79%  
Allowance coverage of net charge-offs (annualized) 6.48 9.92 7.60 12.67  
Ending total loans, gross $ 643,614 $ 705,691 $ 643,614 $ 705,691  
Average loans in repayment 518,226 540,018 532,275 547,394  
Ending loans in repayment 489,920 530,476 489,920 530,476  
Private Education Loan provision for credit losses, other impacts 29 50 110 77  
Private Education Loans          
Allowance for Credit Losses          
Beginning balance 1,074,744 1,154,540 1,158,977 1,355,844 1,355,844
Transfer from unfunded commitment liability 168,377 110,613 303,591 262,049  
Provision for current period 95,482 (6,995) 168,473 (260,923)  
Loan sale reduction to provision (50,226) 0 (171,325) (10,335)  
Loans transferred to held-for-sale 0   0    
Loans transferred from held-for-sale       1,887  
Total provisions 45,256 (6,995) (2,852) (269,371)  
Net charge-offs:          
Charge-offs (109,350) (56,000) (299,699) (161,039)  
Recoveries 11,400 7,302 30,410 21,977  
Net charge-offs (97,950) (48,698) (269,289) (139,062)  
Ending Balance 1,190,427 1,209,460 1,190,427 1,209,460 1,158,977
Allowance          
Ending balance: individually evaluated for impairment 0 69,626 0 69,626  
Ending balance: collectively evaluated for impairment 1,190,427 1,139,834 1,190,427 1,139,834  
Loans:          
Ending balance: individually evaluated for impairment 0 1,148,282 0 1,148,282  
Ending balance: collectively evaluated for impairment $ 20,104,463 $ 20,554,555 $ 20,104,463 $ 20,554,555  
Net charge-offs as a percentage of average loans in repayment (annualized) 2.67% 1.29% 2.37% 1.25%  
Allowance as a percentage of the ending total loan balance 5.92% 5.57% 5.92% 5.57%  
Allowance as a percentage of the ending loans in repayment 8.18% 7.81% 8.18% 7.81%  
Allowance coverage of net charge-offs (annualized) 3.04 6.21 3.32 6.52  
Ending total loans, gross $ 20,104,463 $ 21,702,837 $ 20,104,463 $ 21,702,837  
Average loans in repayment 14,674,437 15,108,802 15,173,465 14,877,937  
Ending loans in repayment 14,546,556 15,490,132 14,546,556 15,490,132  
Provisions for loan losses 45,256 (6,995) (2,852) (269,371)  
Provisions for unfunded loan commitments 162,646 144,972 338,672 251,135  
Total Private Education Loan provisions for credit losses 207,902 137,977 335,820 (18,236)  
Credit Cards          
Allowance for Credit Losses          
Beginning balance 2,393 1,442 2,281 1,501 1,501
Transfer from unfunded commitment liability 0 0 0 0  
Provision for current period 2,039 415 2,635 511  
Loan sale reduction to provision 0 0 0 0  
Loans transferred to held-for-sale (2,372)   (2,372)    
Loans transferred from held-for-sale       0  
Total provisions (333) 415 263 511  
Net charge-offs:          
Charge-offs (2,062) (119) (2,549) (281)  
Recoveries 2 3 5 10  
Net charge-offs (2,060) (116) (2,544) (271)  
Ending Balance 0 1,741 0 1,741 $ 2,281
Allowance          
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 0 1,741 0 1,741  
Loans:          
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment $ 0 $ 17,766 $ 0 $ 17,766  
Net charge-offs as a percentage of average loans in repayment (annualized) 0.00% 3.07% 0.00% 2.75%  
Allowance as a percentage of the ending total loan balance 0.00% 9.80% 0.00% 9.80%  
Allowance as a percentage of the ending loans in repayment 0.00% 9.80% 0.00% 9.80%  
Allowance coverage of net charge-offs (annualized) 0 3.75 0 4.82  
Ending total loans, gross $ 0 $ 17,766 $ 0 $ 17,766  
Average loans in repayment 0 15,098 0 13,136  
Ending loans in repayment 0 17,766 0 17,766  
Private Education Loan provision for credit losses, other impacts $ (333) $ 415 $ 263 $ 511