Allowance for Credit Losses - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($)
$ in Thousands |
Mar. 31, 2024 |
Dec. 31, 2023 |
Mar. 31, 2023 |
Dec. 31, 2022 |
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Private Education Loans allowance for losses |
$ (1,350,058)
|
$ (1,339,772)
|
$ (1,479,306)
|
$ (1,357,075)
|
| Private Education Loans, net |
$ 20,200,789
|
$ 20,306,357
|
|
|
| Percentage of Private Education Loans in repayment, Year 1 |
52.10%
|
55.60%
|
|
|
| Percentage of Private Education Loans in repayment, Year 2 |
56.30%
|
65.30%
|
|
|
| Percentage of Private Education Loans in repayment, Year 3 |
66.20%
|
75.20%
|
|
|
| Percentage of Private Education Loans in repayment, Year 4 |
75.10%
|
81.10%
|
|
|
| Percentage of Private Education Loans in repayment, Year 5 |
80.60%
|
85.00%
|
|
|
| Percentage of Private Education Loans in repayment, After Year 5 |
88.00%
|
89.30%
|
|
|
| Percentage of Private Education Loans in repayment |
71.40%
|
73.30%
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 1 |
0.50%
|
1.00%
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 2 |
1.00%
|
2.10%
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 3 |
2.80%
|
3.60%
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 4 |
3.60%
|
4.10%
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 5 |
3.70%
|
4.50%
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, After Year 5 |
5.30%
|
6.80%
|
|
|
| Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment |
3.40%
|
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 |
1.00%
|
2.70%
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, Year 3 |
4.20%
|
2.60%
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, Year 4 |
3.60%
|
2.30%
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, Year 5 |
3.20%
|
2.20%
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance, After Year 5 |
2.20%
|
1.90%
|
|
|
| Loans in forbearance as a percentage of loans in repayment and forbearance |
2.50%
|
2.10%
|
|
|
| Consumer Portfolio Segment | Student Loan |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Total Private Education Loans in Repayment, Year 1 |
$ 482,998
|
$ 2,494,814
|
|
|
| Total Private Education Loans in Repayment, Year 2 |
3,267,486
|
3,323,327
|
|
|
| Total Private Education Loans in Repayment, Year 3 |
2,643,579
|
2,209,734
|
|
|
| Total Private Education Loans in Repayment, Year 4 |
1,842,892
|
1,475,858
|
|
|
| Total Private Education Loans in Repayment, Year 5 |
1,294,286
|
1,386,889
|
|
|
| Total Private Education Loans in Repayment, After Year 5 |
5,430,451
|
4,519,192
|
|
|
| Total Private Education Loans in repayment |
14,961,692
|
15,409,814
|
|
|
| Total Private Education Loans, gross, Year 1 |
926,224
|
4,490,119
|
|
|
| Total Private Education Loans, gross, Year 2 |
5,803,342
|
5,088,739
|
|
|
| Total Private Education Loans, gross, Year 3 |
3,994,361
|
2,937,422
|
|
|
| Total Private Education Loans, gross, Year 4 |
2,454,339
|
1,819,089
|
|
|
| Total Private Education Loans, gross, Year 5 |
1,606,219
|
1,632,300
|
|
|
| Total Private Education Loans, gross, After Year 5 |
6,167,861
|
5,058,175
|
|
|
| Total Private Education Loans, gross |
20,952,346
|
21,025,844
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 1 |
10,902
|
35,616
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 2 |
31,667
|
18,556
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 3 |
14,460
|
9,465
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 4 |
7,834
|
5,809
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), Year 5 |
5,078
|
3,556
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount), After Year 5 |
10,927
|
8,552
|
|
|
| Private Education Loans deferred origination costs and unamortized premium/(discount) |
80,868
|
81,554
|
|
|
| Total Private Education Loans, Year 1 |
937,126
|
4,525,735
|
|
|
| Total Private Education Loans, Year 2 |
5,835,009
|
5,107,295
|
|
|
| Total Private Education Loans, Year 3 |
4,008,821
|
2,946,887
|
|
|
| Total Private Education Loans, Year 4 |
2,462,173
|
1,824,898
|
|
|
| Total Private Education Loans, Year 5 |
1,611,297
|
1,635,856
|
|
|
| Total Private Education Loans, After Year 5 |
6,178,788
|
5,066,727
|
|
|
| Total Private Education Loans |
21,033,214
|
21,107,398
|
|
|
| Private Education Loans allowance for losses, Year 1 |
(67,459)
|
(269,642)
|
|
|
| Private Education Loans allowance for losses, Year 2 |
(354,779)
|
(335,090)
|
|
|
| Private Education Loans allowance for losses, Year 3 |
(271,004)
|
(194,104)
|
|
|
| Private Education Loans allowance for losses, Year 4 |
(164,549)
|
(118,755)
|
|
|
| Private Education Loans allowance for losses, Year 5 |
(105,385)
|
(100,111)
|
|
|
| Private Education Loans allowance for losses, After Year 5 |
(382,255)
|
(317,403)
|
|
|
| Private Education Loans allowance for losses |
(1,345,431)
|
(1,335,105)
|
|
|
| Private Education Loans, net, Year 1 |
869,667
|
4,256,093
|
|
|
| Private Education Loans, net, Year 2 |
5,480,230
|
4,772,205
|
|
|
| Private Education Loans, net, Year 3 |
3,737,817
|
2,752,783
|
|
|
| Private Education Loans, net, Year 4 |
2,297,624
|
1,706,143
|
|
|
| Private Education Loans, net, Year 5 |
1,505,912
|
1,535,745
|
|
|
| Private Education Loans, net, After Year 5 |
5,796,533
|
4,749,324
|
|
|
| Private Education Loans, net |
19,687,783
|
19,772,293
|
|
|
| Consumer Portfolio Segment | Student Loan | Loan delinquent, current |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Year 1 |
480,422
|
2,469,817
|
|
|
| Year 2 |
3,236,356
|
3,254,534
|
|
|
| Year 3 |
2,569,306
|
2,131,040
|
|
|
| Year 4 |
1,776,854
|
1,416,069
|
|
|
| Year 5 |
1,245,882
|
1,323,825
|
|
|
| After Year 5 |
5,142,786
|
4,213,986
|
|
|
| Loan type |
14,451,606
|
14,809,271
|
|
|
| Consumer Portfolio Segment | Student Loan | Loan delinquent 30-59 days |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Year 1 |
2,576
|
17,599
|
|
|
| Year 2 |
18,739
|
34,627
|
|
|
| Year 3 |
32,476
|
37,147
|
|
|
| Year 4 |
30,460
|
28,020
|
|
|
| Year 5 |
22,553
|
31,432
|
|
|
| After Year 5 |
133,231
|
149,926
|
|
|
| Loan type |
240,035
|
298,751
|
|
|
| Consumer Portfolio Segment | Student Loan | Loan delinquent 60-89 days |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Year 1 |
0
|
5,720
|
|
|
| Year 2 |
7,600
|
17,227
|
|
|
| Year 3 |
20,016
|
20,077
|
|
|
| Year 4 |
17,424
|
16,614
|
|
|
| Year 5 |
12,482
|
15,482
|
|
|
| After Year 5 |
76,399
|
75,897
|
|
|
| Loan type |
133,921
|
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 |
0
|
1,678
|
|
|
| Year 2 |
4,791
|
16,939
|
|
|
| Year 3 |
21,781
|
21,470
|
|
|
| Year 4 |
18,154
|
15,155
|
|
|
| Year 5 |
13,369
|
16,150
|
|
|
| After Year 5 |
78,035
|
79,383
|
|
|
| Loan type |
136,130
|
150,775
|
|
|
| Loans In-School/Grace/Deferment | Consumer Portfolio Segment | Student Loan |
|
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
|
| Year 1 |
442,021
|
1,976,040
|
|
|
| Year 2 |
2,501,814
|
1,672,333
|
|
|
| Year 3 |
1,235,053
|
669,250
|
|
|
| Year 4 |
541,726
|
307,781
|
|
|
| Year 5 |
268,959
|
213,593
|
|
|
| After Year 5 |
613,124
|
452,994
|
|
|
| Loan type |
5,602,697
|
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 |
1,205
|
19,265
|
|
|
| Total Private Education Loans in forbearance, Year 2 |
34,042
|
93,079
|
|
|
| Total Private Education Loans in forbearance, Year 3 |
115,729
|
58,438
|
|
|
| Total Private Education Loans in forbearance, Year 4 |
69,721
|
35,450
|
|
|
| Total Private Education Loans in forbearance, Year 5 |
42,974
|
31,818
|
|
|
| Total Private Education Loans in forbearance, After Year 5 |
124,286
|
85,989
|
|
|
| Total Private Education Loans in forbearance |
$ 387,957
|
$ 324,039
|
|
|