Allowance for Credit Losses - Loan Portfolio Stratified by Key Credit Quality Indicators (Details) - USD ($)
$ in Thousands |
3 Months Ended |
12 Months Ended |
Mar. 31, 2024 |
Mar. 31, 2023 |
Dec. 31, 2023 |
| % of Balance |
|
|
|
| Current period gross charge-offs, total |
$ 93,997
|
$ 96,082
|
|
| Current period recoveries, total |
11,314
|
11,997
|
|
| Current period net charge-offs, total |
82,683
|
$ 84,085
|
|
| Consumer Portfolio Segment | Student Loan |
|
|
|
| % of Balance |
|
|
|
| Current period gross charge-offs, Year 1 |
(7)
|
|
$ (1,812)
|
| Current period gross charge-offs, Year 2 |
(2,683)
|
|
(31,032)
|
| Current period gross charge-offs, Year 3 |
(13,167)
|
|
(70,331)
|
| Current period gross charge-offs, Year 4 |
(14,125)
|
|
(49,624)
|
| Current period gross charge-offs, Year 5 |
(9,561)
|
|
(50,585)
|
| Current period gross charge-offs, After Year 5 |
(54,331)
|
|
(216,711)
|
| Current period gross charge-offs, total |
93,874
|
|
420,095
|
| Current period recoveries, Year 1 |
0
|
|
172
|
| Current period recoveries, Year 2 |
212
|
|
2,342
|
| Current period recoveries, Year 3 |
1,397
|
|
6,496
|
| Current period recoveries, Year 4 |
1,518
|
|
4,923
|
| Current period recoveries, Year 5 |
1,033
|
|
5,260
|
| Current period recoveries, After Year 5 |
7,154
|
|
27,175
|
| Current period recoveries, total |
11,314
|
|
46,368
|
| Current period net charge-offs, Year 1 |
(7)
|
|
(1,640)
|
| Current period net charge-offs, Year 2 |
(2,471)
|
|
(28,690)
|
| Current period recoveries, Year 3 |
(11,770)
|
|
(63,835)
|
| Current period recoveries, Year 4 |
(12,607)
|
|
(44,701)
|
| Current period recoveries, Year 5 |
(8,528)
|
|
(45,325)
|
| Current period recoveries, After Year 5 |
(47,177)
|
|
(189,536)
|
| Current period net charge-offs, total |
82,560
|
|
373,727
|
| Total accrued interest by origination vintage, Year 1 |
15,497
|
|
177,959
|
| Total accrued interest by origination vintage, Year 2 |
281,098
|
|
408,800
|
| Total accrued interest by origination vintage, Year 3 |
365,340
|
|
269,978
|
| Total accrued interest by origination vintage, Year 4 |
240,093
|
|
152,094
|
| Total accrued interest by origination vintage, Year 5 |
138,852
|
|
116,618
|
| Total accrued interest by origination vintage, After Year 5 |
317,107
|
|
229,116
|
| Total accrued interest by origination vintage |
1,357,987
|
|
1,354,565
|
| Consumer Portfolio Segment | Student Loan | With and without cosigners |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
926,224
|
|
4,490,119
|
| Year 2 |
5,803,342
|
|
5,088,739
|
| Year 3 |
3,994,361
|
|
2,937,422
|
| Year 4 |
2,454,339
|
|
1,819,089
|
| Year 5 |
1,606,219
|
|
1,632,300
|
| After Year 5 |
6,167,861
|
|
5,058,175
|
| Loan type |
$ 20,952,346
|
|
$ 21,025,844
|
| % of Balance |
|
|
|
| Total in percent |
100.00%
|
|
100.00%
|
| Consumer Portfolio Segment | Student Loan | With cosigner |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 814,592
|
|
$ 3,903,676
|
| Year 2 |
5,130,203
|
|
4,428,163
|
| Year 3 |
3,451,511
|
|
2,516,380
|
| Year 4 |
2,089,098
|
|
1,535,308
|
| Year 5 |
1,347,339
|
|
1,378,699
|
| After Year 5 |
5,440,233
|
|
4,529,768
|
| Loan type |
$ 18,272,976
|
|
$ 18,291,994
|
| % of Balance |
|
|
|
| Private education loans |
87.00%
|
|
87.00%
|
| Consumer Portfolio Segment | Student Loan | Without cosigner |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 111,632
|
|
$ 586,443
|
| Year 2 |
673,139
|
|
660,576
|
| Year 3 |
542,850
|
|
421,042
|
| Year 4 |
365,241
|
|
283,781
|
| Year 5 |
258,880
|
|
253,601
|
| After Year 5 |
727,628
|
|
528,407
|
| Loan type |
$ 2,679,370
|
|
$ 2,733,850
|
| % of Balance |
|
|
|
| Private education loans |
13.00%
|
|
13.00%
|
| Consumer Portfolio Segment | Student Loan | FICO at Origination |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 926,224
|
|
$ 4,490,119
|
| Year 2 |
5,803,342
|
|
5,088,739
|
| Year 3 |
3,994,361
|
|
2,937,422
|
| Year 4 |
2,454,339
|
|
1,819,089
|
| Year 5 |
1,606,219
|
|
1,632,300
|
| After Year 5 |
6,167,861
|
|
5,058,175
|
| Loan type |
$ 20,952,346
|
|
$ 21,025,844
|
| % of Balance |
|
|
|
| Total in percent |
100.00%
|
|
100.00%
|
| Consumer Portfolio Segment | Student Loan | FICO at Origination | Less than 670 |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 61,789
|
|
$ 328,199
|
| Year 2 |
424,857
|
|
395,526
|
| Year 3 |
316,552
|
|
208,696
|
| Year 4 |
176,921
|
|
118,935
|
| Year 5 |
105,953
|
|
137,494
|
| After Year 5 |
546,958
|
|
451,613
|
| Loan type |
$ 1,633,030
|
|
$ 1,640,463
|
| % of Balance |
|
|
|
| Private education loans at origination |
8.00%
|
|
8.00%
|
| Consumer Portfolio Segment | Student Loan | FICO at Origination | 670-699 |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 129,467
|
|
$ 635,642
|
| Year 2 |
816,049
|
|
704,642
|
| Year 3 |
553,845
|
|
400,744
|
| Year 4 |
332,430
|
|
254,762
|
| Year 5 |
226,123
|
|
257,840
|
| After Year 5 |
1,041,796
|
|
868,777
|
| Loan type |
$ 3,099,710
|
|
$ 3,122,407
|
| % of Balance |
|
|
|
| Private education loans at origination |
15.00%
|
|
15.00%
|
| Consumer Portfolio Segment | Student Loan | FICO at Origination | 700-749 |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 288,936
|
|
$ 1,383,779
|
| Year 2 |
1,783,230
|
|
1,586,783
|
| Year 3 |
1,243,850
|
|
934,033
|
| Year 4 |
779,798
|
|
590,401
|
| Year 5 |
522,793
|
|
545,333
|
| After Year 5 |
2,082,333
|
|
1,709,299
|
| Loan type |
$ 6,700,940
|
|
$ 6,749,628
|
| % of Balance |
|
|
|
| Private education loans at origination |
32.00%
|
|
32.00%
|
| Consumer Portfolio Segment | Student Loan | FICO at Origination | Greater than or equal to 750 |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 446,032
|
|
$ 2,142,499
|
| Year 2 |
2,779,206
|
|
2,401,788
|
| Year 3 |
1,880,114
|
|
1,393,949
|
| Year 4 |
1,165,190
|
|
854,991
|
| Year 5 |
751,350
|
|
691,633
|
| After Year 5 |
2,496,774
|
|
2,028,486
|
| Loan type |
$ 9,518,666
|
|
$ 9,513,346
|
| % of Balance |
|
|
|
| Private education loans at origination |
45.00%
|
|
45.00%
|
| Consumer Portfolio Segment | Student Loan | FICO Refreshed |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 926,224
|
|
$ 4,490,119
|
| Year 2 |
5,803,342
|
|
5,088,739
|
| Year 3 |
3,994,361
|
|
2,937,422
|
| Year 4 |
2,454,339
|
|
1,819,089
|
| Year 5 |
1,606,219
|
|
1,632,300
|
| After Year 5 |
6,167,861
|
|
5,058,175
|
| Loan type |
$ 20,952,346
|
|
$ 21,025,844
|
| % of Balance |
|
|
|
| Total in percent |
100.00%
|
|
100.00%
|
| Consumer Portfolio Segment | Student Loan | FICO Refreshed | Less than 670 |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 84,355
|
|
$ 495,451
|
| Year 2 |
669,427
|
|
638,381
|
| Year 3 |
541,494
|
|
379,738
|
| Year 4 |
335,868
|
|
217,956
|
| Year 5 |
205,407
|
|
214,665
|
| After Year 5 |
951,407
|
|
791,875
|
| Loan type |
$ 2,787,958
|
|
$ 2,738,066
|
| % of Balance |
|
|
|
| Private education loans at origination |
13.00%
|
|
13.00%
|
| Consumer Portfolio Segment | Student Loan | FICO Refreshed | 670-699 |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 129,421
|
|
$ 616,684
|
| Year 2 |
789,950
|
|
672,777
|
| Year 3 |
514,154
|
|
365,674
|
| Year 4 |
299,737
|
|
193,462
|
| Year 5 |
167,203
|
|
176,963
|
| After Year 5 |
671,160
|
|
564,245
|
| Loan type |
$ 2,571,625
|
|
$ 2,589,805
|
| % of Balance |
|
|
|
| Private education loans at origination |
12.00%
|
|
12.00%
|
| Consumer Portfolio Segment | Student Loan | FICO Refreshed | 700-749 |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 286,786
|
|
$ 1,347,094
|
| Year 2 |
1,700,049
|
|
1,477,310
|
| Year 3 |
1,127,465
|
|
836,747
|
| Year 4 |
678,404
|
|
498,414
|
| Year 5 |
430,414
|
|
445,244
|
| After Year 5 |
1,643,152
|
|
1,361,073
|
| Loan type |
$ 5,866,270
|
|
$ 5,965,882
|
| % of Balance |
|
|
|
| Private education loans at origination |
28.00%
|
|
28.00%
|
| Consumer Portfolio Segment | Student Loan | FICO Refreshed | Greater than or equal to 750 |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 425,662
|
|
$ 2,030,890
|
| Year 2 |
2,643,916
|
|
2,300,271
|
| Year 3 |
1,811,248
|
|
1,355,263
|
| Year 4 |
1,140,330
|
|
909,257
|
| Year 5 |
803,195
|
|
795,428
|
| After Year 5 |
2,902,142
|
|
2,340,982
|
| Loan type |
$ 9,726,493
|
|
$ 9,732,091
|
| % of Balance |
|
|
|
| Private education loans at origination |
47.00%
|
|
47.00%
|
| Consumer Portfolio Segment | Student Loan | Seasoning |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 926,224
|
|
$ 4,490,119
|
| Year 2 |
5,803,342
|
|
5,088,739
|
| Year 3 |
3,994,361
|
|
2,937,422
|
| Year 4 |
2,454,339
|
|
1,819,089
|
| Year 5 |
1,606,219
|
|
1,632,300
|
| After Year 5 |
6,167,861
|
|
5,058,175
|
| Loan type |
$ 20,952,346
|
|
$ 21,025,844
|
| % of Balance |
|
|
|
| Total in percent |
100.00%
|
|
100.00%
|
| Consumer Portfolio Segment | Student Loan | Seasoning | 1-12 payments |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 484,203
|
|
$ 2,514,079
|
| Year 2 |
3,024,087
|
|
740,450
|
| Year 3 |
508,182
|
|
440,293
|
| Year 4 |
323,857
|
|
245,631
|
| Year 5 |
191,566
|
|
208,941
|
| After Year 5 |
433,762
|
|
332,608
|
| Loan type |
$ 4,965,657
|
|
$ 4,482,002
|
| % of Balance |
|
|
|
| Seasoning based on monthly scheduled payments due from 1-12 payments |
24.00%
|
|
21.00%
|
| Consumer Portfolio Segment | Student Loan | Seasoning | 13-24 payments |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 0
|
|
$ 0
|
| Year 2 |
277,441
|
|
2,675,956
|
| Year 3 |
2,095,039
|
|
303,045
|
| Year 4 |
206,882
|
|
167,532
|
| Year 5 |
147,749
|
|
165,577
|
| After Year 5 |
467,866
|
|
384,760
|
| Loan type |
$ 3,194,977
|
|
$ 3,696,870
|
| % of Balance |
|
|
|
| Seasoning based on monthly scheduled payments due from 13 - 24 payments |
15.00%
|
|
18.00%
|
| Consumer Portfolio Segment | Student Loan | Seasoning | 25-36 payments |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 0
|
|
$ 0
|
| Year 2 |
0
|
|
0
|
| Year 3 |
156,087
|
|
1,524,834
|
| Year 4 |
1,301,243
|
|
195,091
|
| Year 5 |
128,581
|
|
129,571
|
| After Year 5 |
559,089
|
|
456,448
|
| Loan type |
$ 2,145,000
|
|
$ 2,305,944
|
| % of Balance |
|
|
|
| Seasoning based on monthly scheduled payments due from 25 - 36 payments |
10.00%
|
|
11.00%
|
| Consumer Portfolio Segment | Student Loan | Seasoning | 37-48 payments |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 0
|
|
$ 0
|
| Year 2 |
0
|
|
0
|
| Year 3 |
0
|
|
0
|
| Year 4 |
80,631
|
|
902,938
|
| Year 5 |
798,248
|
|
208,521
|
| After Year 5 |
529,743
|
|
446,350
|
| Loan type |
$ 1,408,622
|
|
$ 1,557,809
|
| % of Balance |
|
|
|
| Seasoning based on monthly scheduled payments due from 37 - 48 payments |
7.00%
|
|
7.00%
|
| Consumer Portfolio Segment | Student Loan | Seasoning | More than 48 payments |
|
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
|
| Year 1 |
$ 0
|
|
$ 0
|
| Year 2 |
0
|
|
0
|
| Year 3 |
0
|
|
0
|
| Year 4 |
0
|
|
116
|
| Year 5 |
71,116
|
|
706,097
|
| After Year 5 |
3,564,277
|
|
2,985,015
|
| Loan type |
$ 3,635,393
|
|
$ 3,691,228
|
| % of Balance |
|
|
|
| Seasoning based on monthly scheduled payments due from more than 48 payments |
17.00%
|
|
18.00%
|
| Consumer Portfolio Segment | Student Loan | Seasoning | Not yet in repayment |
|
|
|
| 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
|
| % of Balance |
|
|
|
| Seasoning based on monthly scheduled payments due from not yet in repayment |
27.00%
|
|
25.00%
|