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Allowance for Loan Losses - Allowance and Recorded Investments in Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | $ 383,997 | $ 295,277 | $ 341,121 | $ 251,475
Total provision | 98,314 | 68,896 | 256,889 | 187,339
Net charge-offs: |  |  |  |
Charge-offs | (76,227) | (40,221) | (205,916) | (124,458)
Recoveries | 8,322 | 5,022 | 22,312 | 15,834
Net charge-offs | (67,905) | (35,199) | (183,604) | (108,624)
Loan sales |  |  |  | (1,216)
Allowance at end of period | 414,406 | 328,974 | 414,406 | 328,974
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 171,884 | 119,643 | 171,884 | 119,643
Ending balance: collectively evaluated for impairment | 242,522 | 209,331 | 242,522 | 209,331
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 1,474,819 | 1,199,493 | 1,474,819 | 1,199,493
Ending balance: collectively evaluated for impairment | 23,575,351 | 21,040,289 | 23,575,351 | 21,040,289
FFELP Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 1,734 | 1,073 | 977 | 1,132
Total provision | 158 | 259 | 1,320 | 742
Net charge-offs: |  |  |  |
Charge-offs | (203) | (252) | (608) | (794)
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | (203) | (252) | (608) | (794)
Loan sales |  |  |  | 0
Allowance at end of period | 1,689 | 1,080 | 1,689 | 1,080
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 1,689 | 1,080 | 1,689 | 1,080
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 798,168 | $ 866,786 | $ 798,168 | $ 866,786
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.13% | 0.15% | 0.13% | 0.15%
Allowance as a percentage of the ending total loan balance | 0.21% | 0.12% | 0.21% | 0.12%
Allowance as a percentage of the ending loans in repayment | 0.27% | 0.16% | 0.27% | 0.16%
Allowance coverage of net charge-offs (annualized) | 2.08 | 1.07 | 2.08 | 1.02
Ending total loans, gross | $ 798,168 | $ 866,786 | $ 798,168 | $ 866,786
Average loans in repayment | 621,706 | 681,131 | 636,538 | 700,679
Ending loans in repayment | 631,626 | 679,110 | 631,626 | 679,110
Private Education Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 307,968 | 261,695 | 277,943 | 243,715
Total provision | 84,110 | 42,482 | 197,289 | 130,616
Net charge-offs: |  |  |  |
Charge-offs | (56,398) | (34,229) | (151,357) | (113,852)
Recoveries | 6,864 | 4,736 | 18,669 | 15,421
Net charge-offs | (49,534) | (29,493) | (132,688) | (98,431)
Loan sales |  |  |  | (1,216)
Allowance at end of period | 342,544 | 274,684 | 342,544 | 274,684
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 171,884 | 119,643 | 171,884 | 119,643
Ending balance: collectively evaluated for impairment | 170,660 | 155,041 | 170,660 | 155,041
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 1,474,819 | 1,199,493 | 1,474,819 | 1,199,493
Ending balance: collectively evaluated for impairment | $ 21,645,350 | $ 19,040,498 | $ 21,645,350 | $ 19,040,498
Net charge-offs as a percentage of average loans in repayment (annualized) | 1.27% | 0.88% | 1.15% | 1.01%
Allowance as a percentage of the ending total loan balance | 1.48% | 1.36% | 1.48% | 1.36%
Allowance as a percentage of the ending loans in repayment | 2.13% | 1.99% | 2.13% | 1.99%
Allowance coverage of net charge-offs (annualized) | 1.73 | 2.33 | 1.94 | 2.09
Ending total loans, gross | $ 23,120,169 | $ 20,239,991 | $ 23,120,169 | $ 20,239,991
Average loans in repayment | 15,632,028 | 13,351,517 | 15,351,188 | 13,009,704
Ending loans in repayment | 16,072,979 | 13,815,415 | 16,072,979 | 13,815,415
Personal Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 74,295 | 32,509 | 62,201 | 6,628
Total provision | 14,046 | 26,155 | 58,280 | 55,981
Net charge-offs: |  |  |  |
Charge-offs | (19,626) | (5,740) | (53,951) | (9,812)
Recoveries | 1,458 | 286 | 3,643 | 413
Net charge-offs | (18,168) | (5,454) | (50,308) | (9,399)
Loan sales |  |  |  | 0
Allowance at end of period | 70,173 | 53,210 | 70,173 | 53,210
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 70,173 | 53,210 | 70,173 | 53,210
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 1,131,833 | $ 1,133,005 | $ 1,131,833 | $ 1,133,005
Net charge-offs as a percentage of average loans in repayment (annualized) | 6.42% | 2.03% | 5.82% | 1.56%
Allowance as a percentage of the ending total loan balance | 6.20% | 4.70% | 6.20% | 4.70%
Allowance as a percentage of the ending loans in repayment | 6.20% | 4.70% | 6.20% | 4.70%
Allowance coverage of net charge-offs (annualized) | 0.97 | 2.44 | 1.05 | 4.25
Ending total loans, gross | $ 1,131,833 | $ 1,133,005 | $ 1,131,833 | $ 1,133,005
Average loans in repayment | 1,131,965 | 1,072,624 | 1,152,555 | 803,928
Ending loans in repayment | $ 1,131,833 | $ 1,133,005 | $ 1,131,833 | $ 1,133,005

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