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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for Loan Losses |  |  |
Beginning balance | $ 341,121 | $ 251,475 | $ 184,701
Total provision | 353,934 | 244,584 | 185,595
Charge-offs | (284,114) | (175,526) | (131,596)
Recoveries | 30,971 | 21,804 | 17,646
Net charge-offs | (253,143) | (153,722) | (113,950)
Loan sales |  | (1,216) | (4,871)
Ending Balance | 441,912 | 341,121 | 251,475
Allowance: |  |  |
Ending balance: individually evaluated for impairment | 186,697 | 120,110 | 94,682
Ending balance: collectively evaluated for impairment | 255,215 | 221,011 | 156,793
Loans: |  |  |
Ending balance: individually evaluated for impairment | 1,581,966 | 1,257,856 | 990,351
Ending balance: collectively evaluated for impairment | 23,443,822 | 21,283,187 | 17,769,756
FFELP Loans |  |  |
Allowance for Loan Losses |  |  |
Beginning balance | 977 | 1,132 | 2,171
Total provision | 1,478 | 980 | (85)
Charge-offs | (822) | (1,135) | (954)
Recoveries | 0 | 0 | 0
Net charge-offs | (822) | (1,135) | (954)
Loan sales |  | 0 | 0
Ending Balance | 1,633 | 977 | 1,132
Allowance: |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 1,633 | 977 | 1,132
Loans: |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 783,306 | $ 846,487 | $ 927,660
Net charge-offs as a percentage of average loans in repayment | 0.13% | 0.16% | 0.13%
Allowance as a percentage of the ending total loan balance | 0.21% | 0.12% | 0.12%
Allowance as a percentage of the ending loans in repayment | 0.26% | 0.15% | 0.15%
Allowance coverage of net charge-offs | 1.99 | 0.86 | 1.19
Ending total loans, gross | $ 783,306 | $ 846,487 | $ 927,660
Average loans in repayment | 631,029 | 691,406 | 745,039
Ending loans in repayment | 617,646 | 665,807 | 746,456
Private Education Loans |  |  |
Allowance for Loan Losses |  |  |
Beginning balance | 277,943 | 243,715 | 182,472
Total provision | 279,570 | 169,287 | 178,542
Charge-offs | (208,978) | (154,701) | (130,063)
Recoveries | 25,765 | 20,858 | 17,635
Net charge-offs | (183,213) | (133,843) | (112,428)
Loan sales |  | (1,216) | (4,871)
Ending Balance | 374,300 | 277,943 | 243,715
Allowance: |  |  |
Ending balance: individually evaluated for impairment | 186,697 | 120,110 | 94,682
Ending balance: collectively evaluated for impairment | 187,603 | 157,833 | 149,033
Loans: |  |  |
Ending balance: individually evaluated for impairment | 1,581,966 | 1,257,856 | 990,351
Ending balance: collectively evaluated for impairment | $ 21,607,625 | $ 19,246,609 | $ 16,441,816
Net charge-offs as a percentage of average loans in repayment | 1.17% | 1.01% | 1.03%
Allowance as a percentage of the ending total loan balance | 1.61% | 1.36% | 1.40%
Allowance as a percentage of the ending loans in repayment | 2.23% | 1.90% | 2.00%
Allowance coverage of net charge-offs | 2.04 | 2.08 | 2.17
Ending total loans, gross | $ 23,189,591 | $ 20,504,465 | $ 17,432,167
Average loans in repayment | 15,605,927 | 13,303,801 | 10,881,058
Ending loans in repayment | 16,787,670 | 14,666,856 | 12,206,033
Personal Loans |  |  |
Allowance for Loan Losses |  |  |
Beginning balance | 62,201 | 6,628 | 58
Total provision | 72,783 | 74,317 | 7,138
Charge-offs | (74,313) | (19,690) | (579)
Recoveries | 5,206 | 946 | 11
Net charge-offs | (69,107) | (18,744) | (568)
Loan sales |  | 0 | 0
Ending Balance | 65,877 | 62,201 | 6,628
Allowance: |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 65,877 | 62,201 | 6,628
Loans: |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 1,049,007 | $ 1,190,091 | $ 400,280
Net charge-offs as a percentage of average loans in repayment | 6.07% | 2.11% | 0.47%
Allowance as a percentage of the ending total loan balance | 6.28% | 5.23% | 1.66%
Allowance as a percentage of the ending loans in repayment | 6.28% | 5.23% | 1.66%
Allowance coverage of net charge-offs | 0.95 | 3.32 | 11.67
Ending total loans, gross | $ 1,049,007 | $ 1,190,091 | $ 400,280
Average loans in repayment | 1,138,887 | 889,348 | 119,606
Ending loans in repayment | 1,049,007 | 1,190,091 | $ 400,280
Credit Cards |  |  |
Allowance for Loan Losses |  |  |
Beginning balance | 0 |  |
Total provision | 103 |  |
Charge-offs | (1) |  |
Recoveries | 0 |  |
Net charge-offs | (1) |  |
Ending Balance | 102 | $ 0 |
Allowance: |  |  |
Ending balance: individually evaluated for impairment | 0 |  |
Ending balance: collectively evaluated for impairment | 102 |  |
Loans: |  |  |
Ending balance: individually evaluated for impairment | 0 |  |
Ending balance: collectively evaluated for impairment | $ 3,884 |  |
Net charge-offs as a percentage of average loans in repayment | 0.13% |  |
Allowance as a percentage of the ending total loan balance | 2.63% |  |
Allowance as a percentage of the ending loans in repayment | 2.63% |  |
Allowance coverage of net charge-offs | 102.00 |  |
Ending total loans, gross | $ 3,884 |  |
Average loans in repayment | 786 |  |
Ending loans in repayment | $ 3,884 |  |

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