Allowance for Credit Losses - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($)
$ in Thousands |
Sep. 30, 2024 |
Jun. 30, 2024 |
Dec. 31, 2023 |
Sep. 30, 2023 |
Jun. 30, 2023 |
Dec. 31, 2022 |
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
| Private Education Loans allowance for losses |
$ (1,413,621)
|
$ (1,269,652)
|
$ (1,339,772)
|
$ (1,416,048)
|
$ (1,364,716)
|
$ (1,357,075)
|
| Private Education Loans, net |
$ 20,459,933
|
|
$ 20,306,357
|
|
|
|
| Percentage of Private Education Loans in repayment, Year 1 |
54.80%
|
|
55.60%
|
|
|
|
| Percentage of Private Education Loans in repayment, Year 2 |
58.50%
|
|
65.30%
|
|
|
|
| Percentage of Private Education Loans in repayment, Year 3 |
69.70%
|
|
75.20%
|
|
|
|
| Percentage of Private Education Loans in repayment, Year 4 |
77.30%
|
|
81.10%
|
|
|
|
| Percentage of Private Education Loans in repayment, Year 5 |
82.20%
|
|
85.00%
|
|
|
|
| Percentage of Private Education Loans in repayment, After Year 5 |
89.00%
|
|
89.30%
|
|
|
|
| Percentage of Private Education Loans in repayment |
70.50%
|
|
73.30%
|
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 1 |
0.30%
|
|
1.00%
|
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 2 |
1.70%
|
|
2.10%
|
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 3 |
3.70%
|
|
3.60%
|
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 4 |
4.30%
|
|
4.10%
|
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 5 |
4.20%
|
|
4.50%
|
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, After Year 5 |
5.90%
|
|
6.80%
|
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment |
3.60%
|
|
3.90%
|
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, Year 1 |
0.20%
|
|
0.80%
|
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, Year 2 |
1.90%
|
|
2.70%
|
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, Year 3 |
2.90%
|
|
2.60%
|
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, Year 4 |
2.40%
|
|
2.30%
|
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, Year 5 |
2.30%
|
|
2.20%
|
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, After Year 5 |
2.00%
|
|
1.90%
|
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance |
1.90%
|
|
2.10%
|
|
|
|
| Consumer Portfolio Segment | Student Loan |
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
| Total Private Education Loans in Repayment, Year 1 |
$ 2,271,922
|
|
$ 2,494,814
|
|
|
|
| Total Private Education Loans in Repayment, Year 2 |
3,136,672
|
|
3,323,327
|
|
|
|
| Total Private Education Loans in Repayment, Year 3 |
2,250,064
|
|
2,209,734
|
|
|
|
| Total Private Education Loans in Repayment, Year 4 |
1,634,932
|
|
1,475,858
|
|
|
|
| Total Private Education Loans in Repayment, Year 5 |
1,165,916
|
|
1,386,889
|
|
|
|
| Total Private Education Loans in Repayment, After Year 5 |
4,900,749
|
|
4,519,192
|
|
|
|
| Total Private Education Loans in repayment |
15,360,255
|
|
15,409,814
|
|
|
|
| Total Private Education Loans, gross, Year 1 |
4,145,008
|
|
4,490,119
|
|
|
|
| Total Private Education Loans, gross, Year 2 |
5,363,248
|
|
5,088,739
|
|
|
|
| Total Private Education Loans, gross, Year 3 |
3,229,776
|
|
2,937,422
|
|
|
|
| Total Private Education Loans, gross, Year 4 |
2,113,786
|
|
1,819,089
|
|
|
|
| Total Private Education Loans, gross, Year 5 |
1,419,153
|
|
1,632,300
|
|
|
|
| Total Private Education Loans, gross, After Year 5 |
5,506,495
|
|
5,058,175
|
|
|
|
| Total Private Education Loans, gross |
21,777,466
|
|
21,025,844
|
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 1 |
37,794
|
|
35,616
|
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 2 |
26,654
|
|
18,556
|
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 3 |
11,375
|
|
9,465
|
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 4 |
6,512
|
|
5,809
|
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 5 |
4,325
|
|
3,556
|
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), After Year 5 |
9,428
|
|
8,552
|
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount) |
96,088
|
|
81,554
|
|
|
|
| Total Private Education Loans, Year 1 |
4,182,802
|
|
4,525,735
|
|
|
|
| Total Private Education Loans, Year 2 |
5,389,902
|
|
5,107,295
|
|
|
|
| Total Private Education Loans, Year 3 |
3,241,151
|
|
2,946,887
|
|
|
|
| Total Private Education Loans, Year 4 |
2,120,298
|
|
1,824,898
|
|
|
|
| Total Private Education Loans, Year 5 |
1,423,478
|
|
1,635,856
|
|
|
|
| Total Private Education Loans, After Year 5 |
5,515,923
|
|
5,066,727
|
|
|
|
| Total Private Education Loans |
21,873,554
|
|
21,107,398
|
|
|
|
| Private Education Loans allowance for losses, Year 1 |
(212,169)
|
|
(269,642)
|
|
|
|
| Private Education Loans allowance for losses, Year 2 |
(313,135)
|
|
(335,090)
|
|
|
|
| Private Education Loans allowance for losses, Year 3 |
(235,225)
|
|
(194,104)
|
|
|
|
| Private Education Loans allowance for losses, Year 4 |
(155,737)
|
|
(118,755)
|
|
|
|
| Private Education Loans allowance for losses, Year 5 |
(95,729)
|
|
(100,111)
|
|
|
|
| Private Education Loans allowance for losses, After Year 5 |
(401,626)
|
|
(317,403)
|
|
|
|
| Private Education Loans allowance for losses |
(1,413,621)
|
|
(1,335,105)
|
|
|
|
| Private Education Loans, net, Year 1 |
3,970,633
|
|
4,256,093
|
|
|
|
| Private Education Loans, net, Year 2 |
5,076,767
|
|
4,772,205
|
|
|
|
| Private Education Loans, net, Year 3 |
3,005,926
|
|
2,752,783
|
|
|
|
| Private Education Loans, net, Year 4 |
1,964,561
|
|
1,706,143
|
|
|
|
| Private Education Loans, net, Year 5 |
1,327,749
|
|
1,535,745
|
|
|
|
| Private Education Loans, net, After Year 5 |
5,114,297
|
|
4,749,324
|
|
|
|
| Private Education Loans, net |
20,459,933
|
|
19,772,293
|
|
|
|
| Consumer Portfolio Segment | Student Loan | Loan delinquent, current |
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
| Year 1 |
2,264,429
|
|
2,469,817
|
|
|
|
| Year 2 |
3,081,961
|
|
3,254,534
|
|
|
|
| Year 3 |
2,166,187
|
|
2,131,040
|
|
|
|
| Year 4 |
1,564,016
|
|
1,416,069
|
|
|
|
| Year 5 |
1,116,464
|
|
1,323,825
|
|
|
|
| After Year 5 |
4,613,926
|
|
4,213,986
|
|
|
|
| Loan type |
14,806,983
|
|
14,809,271
|
|
|
|
| Consumer Portfolio Segment | Student Loan | Loan delinquent 30-59 days |
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
| Year 1 |
5,536
|
|
17,599
|
|
|
|
| Year 2 |
31,829
|
|
34,627
|
|
|
|
| Year 3 |
41,997
|
|
37,147
|
|
|
|
| Year 4 |
34,974
|
|
28,020
|
|
|
|
| Year 5 |
23,902
|
|
31,432
|
|
|
|
| After Year 5 |
147,233
|
|
149,926
|
|
|
|
| Loan type |
285,471
|
|
298,751
|
|
|
|
| Consumer Portfolio Segment | Student Loan | Loan delinquent 60-89 days |
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
| Year 1 |
1,314
|
|
5,720
|
|
|
|
| Year 2 |
15,492
|
|
17,227
|
|
|
|
| Year 3 |
24,717
|
|
20,077
|
|
|
|
| Year 4 |
20,840
|
|
16,614
|
|
|
|
| Year 5 |
14,467
|
|
15,482
|
|
|
|
| After Year 5 |
72,268
|
|
75,897
|
|
|
|
| Loan type |
149,098
|
|
151,017
|
|
|
|
| Consumer Portfolio Segment | Student Loan | Loan delinquent 90 days or greater past due |
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
| Year 1 |
643
|
|
1,678
|
|
|
|
| Year 2 |
7,390
|
|
16,939
|
|
|
|
| Year 3 |
17,163
|
|
21,470
|
|
|
|
| Year 4 |
15,102
|
|
15,155
|
|
|
|
| Year 5 |
11,083
|
|
16,150
|
|
|
|
| After Year 5 |
67,322
|
|
79,383
|
|
|
|
| Loan type |
118,703
|
|
150,775
|
|
|
|
| Loans In-school/grace/deferment | Consumer Portfolio Segment | Student Loan |
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
| Year 1 |
1,868,692
|
|
1,976,040
|
|
|
|
| Year 2 |
2,166,252
|
|
1,672,333
|
|
|
|
| Year 3 |
912,688
|
|
669,250
|
|
|
|
| Year 4 |
438,760
|
|
307,781
|
|
|
|
| Year 5 |
225,235
|
|
213,593
|
|
|
|
| After Year 5 |
504,170
|
|
452,994
|
|
|
|
| Loan type |
6,115,797
|
|
5,291,991
|
|
|
|
| Loans In forbearance | Consumer Portfolio Segment | Student Loan |
|
|
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
|
|
| Total Private Education Loans in forbearance, Year 1 |
4,394
|
|
19,265
|
|
|
|
| Total Private Education Loans in forbearance, Year 2 |
60,324
|
|
93,079
|
|
|
|
| Total Private Education Loans in forbearance, Year 3 |
67,024
|
|
58,438
|
|
|
|
| Total Private Education Loans in forbearance, Year 4 |
40,094
|
|
35,450
|
|
|
|
| Total Private Education Loans in forbearance, Year 5 |
28,002
|
|
31,818
|
|
|
|
| Total Private Education Loans in forbearance, After Year 5 |
101,576
|
|
85,989
|
|
|
|
| Total Private Education Loans in forbearance |
$ 301,414
|
|
$ 324,039
|
|
|
|