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Allowance for Credit Losses - Allowance and Recorded Investments in Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for Credit Losses      
Beginning Balance $ 1,357,075 $ 1,165,335 $ 1,361,723
Transfer from unfunded commitment liability 320,237 344,310 301,655
Provision for current period 242,571 413,535 (232,708)
Loan sale reduction to provision (205,383) (174,231) (66,460)
Loans transferred to held-for-sale 0 (2,372) (1,887)
Total provisions 37,188 236,932 (297,281)
Net charge-offs      
Charge-offs (421,096) (431,244) (230,268)
Recoveries 46,368 41,742 29,506
Net charge-offs (374,728) (389,502) (200,762)
Ending Balance 1,339,772 1,357,075 1,165,335
Allowance      
Ending balance: individually evaluated for impairment     47,712
Ending balance: collectively evaluated for impairment 1,339,772 1,357,075 1,117,623
Loans      
Ending balance: individually evaluated for impairment     1,057,665
Ending balance: collectively evaluated for impairment 21,563,245 20,912,738 20,379,428
Accrued interest to be capitalized      
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment 1,203,357 936,837 947,391
Private Education Loan provision for credit losses, other impacts 2,224 909 1,144
Provisions for credit losses reported in consolidated statements of income 345,463 633,453 (32,957)
Adjustments      
Allowance for Credit Losses      
Beginning Balance (259,536)    
Net charge-offs      
Ending Balance (259,536) (259,536)  
FFELP Loans      
Allowance for Credit Losses      
Beginning Balance 3,444 4,077 4,378
Transfer from unfunded commitment liability 0 0 0
Provision for current period 2,224 (20) 20
Loan sale reduction to provision 0 0 0
Loans transferred to held-for-sale 0 0 0
Total provisions 2,224 (20) 20
Net charge-offs      
Charge-offs (1,001) (613) (321)
Recoveries 0 0 0
Net charge-offs (1,001) (613) (321)
Ending Balance 4,667 3,444 4,077
Allowance      
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment 4,667 3,444 4,077
Loans      
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment 537,401 609,050 695,216
Accrued interest to be capitalized      
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment $ 0 $ 0 $ 0
Net charge-offs as a percentage of average loans in repayment (annualized) 0.23% 0.12% 0.06%
Allowance as a percentage of the ending total loan balance and accrued interest to be capitalized 0.87% 0.57% 0.59%
Allowance as a percentage of the ending loans in repayment and accrued interest to be capitalized on loans in repayment 1.15% 0.76% 0.74%
Allowance coverage of net charge-offs 4.66 5.62 12.70
Ending total loans, gross $ 537,401 $ 609,050 $ 695,216
Average loans in repayment 433,225 517,139 545,689
Ending loans in repayment 406,568 453,915 553,980
Accrued interest to be capitalized on loans in repayment 0 0 0
Private Education Loan provision for credit losses, other impacts 2,224 (20) 20
Private Education Loans      
Allowance for Credit Losses      
Beginning Balance 1,353,631 1,158,977 1,355,844
Transfer from unfunded commitment liability 320,237 344,310 301,655
Provision for current period 240,347 410,254 (233,852)
Loan sale reduction to provision (205,383) (174,231) (66,460)
Loans transferred to held-for-sale 0 0 (1,887)
Total provisions 34,964 236,023 (298,425)
Net charge-offs      
Charge-offs (420,095) (427,416) (229,591)
Recoveries 46,368 41,737 29,494
Net charge-offs (373,727) (385,679) (200,097)
Ending Balance 1,335,105 1,353,631 1,158,977
Allowance      
Ending balance: individually evaluated for impairment     47,712
Ending balance: collectively evaluated for impairment 1,335,105 1,353,631 1,111,265
Loans      
Ending balance: individually evaluated for impairment     1,057,665
Ending balance: collectively evaluated for impairment 21,025,844 20,303,688 19,659,198
Accrued interest to be capitalized      
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment $ 1,203,357 $ 936,837 $ 947,391
Net charge-offs as a percentage of average loans in repayment (annualized) 2.44% 2.55% 1.33%
Allowance as a percentage of the ending total loan balance and accrued interest to be capitalized 6.01% 6.37% 5.35%
Allowance as a percentage of the ending loans in repayment and accrued interest to be capitalized on loans in repayment 8.43% 8.76% 7.32%
Allowance coverage of net charge-offs 3.57 3.51 5.79
Ending total loans, gross $ 21,025,844 $ 20,303,688 $ 20,716,863
Average loans in repayment 15,310,934 15,103,123 15,019,869
Ending loans in repayment 15,409,814 15,129,550 15,511,212
Accrued interest to be capitalized on loans in repayment 435,807 324,384 312,537
Provisions for loan losses 34,964 236,023 (298,425)
Provisions for unfunded loan commitments 308,275 396,521 264,324
Total Private Education Loan provisions for credit losses 343,239 632,544 (34,101)
Credit Cards      
Allowance for Credit Losses      
Beginning Balance $ 0 2,281 1,501
Transfer from unfunded commitment liability   0 0
Provision for current period   3,301 1,124
Loan sale reduction to provision   0 0
Loans transferred to held-for-sale   (2,372) 0
Total provisions   929 1,124
Net charge-offs      
Charge-offs   (3,215) (356)
Recoveries   5 12
Net charge-offs   (3,210) (344)
Ending Balance   0 2,281
Allowance      
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment   0 2,281
Loans      
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment   0 25,014
Accrued interest to be capitalized      
Ending balance: individually evaluated for impairment     0
Ending balance: collectively evaluated for impairment   $ 0 $ 0
Net charge-offs as a percentage of average loans in repayment (annualized)   0.00% 2.24%
Allowance as a percentage of the ending total loan balance and accrued interest to be capitalized   0.00% 9.12%
Allowance as a percentage of the ending loans in repayment and accrued interest to be capitalized on loans in repayment   0.00% 9.12%
Allowance coverage of net charge-offs   0 6.63
Ending total loans, gross   $ 0 $ 25,014
Average loans in repayment   0 15,343
Ending loans in repayment   0 25,014
Accrued interest to be capitalized on loans in repayment   0 0
Private Education Loan provision for credit losses, other impacts   $ 929 $ 1,124