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Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020 | Mar. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Private Education Loans allowance for losses | $ 1,673,324 | $ 441,912 | $ 441,912 | $ 358,325 | $ 341,121
Loans held for investment, net | $ 21,695,851 | $ 24,667,792 |  |  |
Percentage of Private Education Loans in repayment, 2020 | 55.30% | 58.20% |  |  |
Percentage of Private Education Loans in repayment, 2019 | 58.50% | 65.40% |  |  |
Percentage of Private Education Loans in repayment, 2018 | 65.10% | 71.20% |  |  |
Percentage of Private Education Loans in repayment, 2017 | 69.40% | 77.20% |  |  |
Percentage of Private Education Loans in repayment, 2016 | 74.80% | 82.20% |  |  |
Percentage of Private Education Loans in repayment, 2015 and prior | 81.10% | 85.40% |  |  |
Percentage of Private Education Loans in repayment | 69.30% | 72.40% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment, 2020 | 0.30% | 0.60% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment, 2019 | 0.70% | 1.20% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment, 2018 | 2.10% | 2.40% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment, 2017 | 3.40% | 3.20% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment, 2016 | 4.00% | 4.00% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment, 2015 and prior | 5.00% | 5.00% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment | 3.20% | 2.80% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2020 | 0.90% | 0.90% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2019 | 1.70% | 3.30% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2018 | 5.50% | 4.80% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2017 | 7.50% | 5.20% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2016 | 8.20% | 5.20% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, 2015 and prior | 8.30% | 4.70% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance | 6.20% | 4.10% |  |  |
Student Loan | Consumer Portfolio Segment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | $ 454,436 |  |  |  |
2019 | 3,020,099 | $ 2,340,221 |  |  |
2018 | 2,422,162 | 3,159,878 |  |  |
2017 | 2,162,435 | 2,781,132 |  |  |
2016 | 1,999,047 | 2,566,815 |  |  |
2015 and Prior | 4,458,032 | 2,225,721 |  |  |
2014 and Prior |  | 3,241,884 |  |  |
Total | 14,516,211 | 16,315,651 |  |  |
Total Private Education Loans in repayment, 2020 | 455,960 | 2,355,395 |  |  |
Total Private Education Loans in repayment, 2019 | 3,042,613 | 3,199,351 |  |  |
Total Private Education Loans in repayment, 2018 | 2,473,820 | 2,850,380 |  |  |
Total Private Education Loans in repayment, 2017 | 2,238,329 | 2,651,946 |  |  |
Total Private Education Loans in repayment, 2016 | 2,082,582 | 2,317,788 |  |  |
Total Private Education Loans in repayment, 2015 and prior | 4,695,041 | 3,412,810 |  |  |
Total Private Education Loans in repayment | 14,988,345 | 16,787,670 |  |  |
Total Private Education Loans, gross, 2020 | 824,430 | 4,047,048 |  |  |
Total Private Education Loans, gross, 2019 | 5,203,123 | 4,888,373 |  |  |
Total Private Education Loans, gross, 2018 | 3,800,248 | 4,003,485 |  |  |
Total Private Education Loans, gross, 2017 | 3,223,127 | 3,433,858 |  |  |
Total Private Education Loans, gross, 2016 | 2,784,550 | 2,821,172 |  |  |
Total Private Education Loans, gross, 2015 and prior | 5,791,269 | 3,995,655 |  |  |
Total Private Education Loans, gross | 21,626,747 | 23,189,591 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2020 | 4,958 | 23,661 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2019 | 20,484 | 17,699 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2018 | 12,515 | 13,843 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2017 | 9,491 | 12,304 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2016 | 7,960 | 8,564 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2015 | 9,859 | 5,153 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Total | 65,267 | 81,224 |  |  |
Total Private Education Loans, 2020 | 829,388 | 4,070,709 |  |  |
Total Private Education Loans, 2019 | 5,223,607 | 4,906,072 |  |  |
Total Private Education Loans, 2018 | 3,812,763 | 4,017,328 |  |  |
Total Private Education Loans, 2017 | 3,232,618 | 3,446,162 |  |  |
Total Private Education Loans, 2016 | 2,792,510 | 2,829,736 |  |  |
Total Private Education Loans, 2015 and Prior | 5,801,128 | 4,000,808 |  |  |
Total Private Education Loans | 21,692,014 | 23,270,815 |  |  |
Private Education Loans allowance for losses, 2020 | 59,208 | 3,013 |  |  |
Private Education Loans allowance for losses, 2019 | 369,890 | 19,105 |  |  |
Private Education Loans allowance for losses, 2018 | 275,259 | 44,858 |  |  |
Private Education Loans allowance for losses, 2017 | 234,085 | 71,598 |  |  |
Private Education Loans allowance for losses, 2016 | 195,324 | 80,974 |  |  |
Private Education Loans allowance for losses, 2015 and prior | 382,015 | 154,752 |  |  |
Private Education Loans allowance for losses | 1,515,781 | 374,300 |  |  |
Private Education Loans, net, 2020 | 770,180 | 4,067,696 |  |  |
Private Education Loans, net, 2019 | 4,853,717 | 4,886,967 |  |  |
Private Education Loans, net, 2018 | 3,537,504 | 3,972,470 |  |  |
Private Education Loans, net, 2017 | 2,998,533 | 3,374,564 |  |  |
Private Education Loans, net, 2016 | 2,597,186 | 2,748,762 |  |  |
Private Education Loans, net, 2015 and prior | 5,419,113 | 3,846,056 |  |  |
Loans held for investment, net | 20,176,233 | 22,896,515 |  |  |
Current period gross charge-offs, 2020 | 0 | 1,697 |  |  |
Current period gross charge-offs, 2019 | 1,597 | 14,650 |  |  |
Current period gross charge-offs, 2018 | 5,241 | 29,119 |  |  |
Current period gross charge-offs, 2017 | 8,136 | 40,576 |  |  |
Current period gross charge-offs, 2015 and prior | 0 | 69 |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery, Originated In Fiscal Year Before Latest Fiscal Year | 92 | 1,016 |  |  |
Current period recoveries, 2018 | 599 | 2,622 |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery, Originated Three Years Before Current Fiscal Year | 1,080 | 4,431 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated In Current Fiscal Year | 0 | 1,628 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated In Fiscal Year Before Latest Fiscal Year | 1,505 | 13,634 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated Two Years Before Current Fiscal Year | 4,642 | 26,497 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated Three Years Before Current Fiscal Year | 7,056 | 36,145 |  |  |
Current period gross charge-offs, 2016 | 10,284 | 41,141 |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery, Originated Four Years Before Current Fiscal Year | 1,505 | 5,175 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Originated Four Years Before Current Fiscal Year | 8,779 | 35,966 |  |  |
Student Loan | Consumer Portfolio Segment | Loan delinquency 31-60 days |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | 1,524 |  |  |  |
2019 | 15,771 | 11,152 |  |  |
2018 | 27,690 | 26,096 |  |  |
2017 | 40,349 | 44,382 |  |  |
2016 | 43,630 | 51,656 |  |  |
2015 and Prior | 125,661 | 54,559 |  |  |
2014 and Prior |  | 100,206 |  |  |
Total | 254,625 | 288,051 |  |  |
Student Loan | Consumer Portfolio Segment | Loan delinquency 61-90 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | 0 |  |  |  |
2019 | 4,760 | 3,087 |  |  |
2018 | 15,016 | 9,527 |  |  |
2017 | 22,286 | 17,048 |  |  |
2016 | 24,645 | 21,161 |  |  |
2015 and Prior | 69,189 | 24,562 |  |  |
2014 and Prior |  | 45,917 |  |  |
Total | 135,896 | 121,302 |  |  |
Student Loan | Consumer Portfolio Segment | Loan delinquency greater than 90 days |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | 0 |  |  |  |
2019 | 1,983 | 935 |  |  |
2018 | 8,952 | 3,850 |  |  |
2017 | 13,259 | 7,818 |  |  |
2016 | 15,260 | 12,314 |  |  |
2015 and Prior | 42,159 | 12,946 |  |  |
2014 and Prior |  | 24,803 |  |  |
Total | 81,613 | 62,666 |  |  |
Student Loan | Loans In-School/Grace/Deferment | Consumer Portfolio Segment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | 364,100 |  |  |  |
2019 | 2,109,092 | 1,670,644 |  |  |
2018 | 1,181,737 | 1,580,513 |  |  |
2017 | 804,181 | 1,010,764 |  |  |
2016 | 515,606 | 635,798 |  |  |
2015 and Prior | 673,761 | 375,585 |  |  |
2014 and Prior |  | 414,101 |  |  |
Total | 5,648,477 | 5,687,405 |  |  |
Student Loan | Loans In Forbearance | Consumer Portfolio Segment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | 4,370 |  |  |  |
2019 | 51,418 | 21,009 |  |  |
2018 | 144,691 | 108,509 |  |  |
2017 | 180,617 | 142,341 |  |  |
2016 | 186,362 | 146,114 |  |  |
2015 and Prior | 422,467 | 127,799 |  |  |
2014 and Prior |  | 168,744 |  |  |
Total | 989,925 | 714,516 |  |  |
Personal Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total | 899,704 | 1,049,007 |  |  |
Private Education Loans allowance for losses | 152,673 | 65,877 | $ 65,877 |  |
Loans held for investment, net | 747,444 | 983,643 |  |  |
Personal Loans | Consumer Portfolio Segment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | 40 |  |  |  |
2019 | 346,123 | 400,216 |  |  |
2018 | 433,664 | 522,778 |  |  |
2017 | 76,188 | 99,581 |  |  |
2016 | 787 | 942 |  |  |
2015 and Prior | 856,802 |  |  |  |
Total Private Education Loans in repayment, 2020 | 40 | 404,776 |  |  |
Total Private Education Loans in repayment, 2019 | 352,469 | 540,784 |  |  |
Total Private Education Loans in repayment, 2018 | 448,556 | 102,464 |  |  |
Total Private Education Loans in repayment, 2017 | 78,335 | 983 |  |  |
Total Private Education Loans in repayment, 2016 | 787 |  |  |  |
Total Private Education Loans in repayment | 880,187 | 1,049,007 |  |  |
Total Private Education Loans, gross, 2020 | 40 | 404,776 |  |  |
Total Private Education Loans, gross, 2019 | 364,849 | 540,784 |  |  |
Total Private Education Loans, gross, 2018 | 455,693 | 102,464 |  |  |
Total Private Education Loans, gross, 2017 | 78,335 | 983 |  |  |
Total Private Education Loans, gross, 2016 | 787 |  |  |  |
Total Private Education Loans, gross | 899,704 | 1,049,007 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2020 | 0 | 380 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2019 | 335 | 133 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2018 | 78 | 0 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2017 | 0 | 0 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), 2016 | 0 |  |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Total | 413 | 513 |  |  |
Total Private Education Loans, 2020 | 40 | 405,156 |  |  |
Total Private Education Loans, 2019 | 365,184 | 540,917 |  |  |
Total Private Education Loans, 2018 | 455,771 | 102,464 |  |  |
Total Private Education Loans, 2017 | 78,335 | 983 |  |  |
Total Private Education Loans, 2016 | 787 |  |  |  |
Total Private Education Loans | 900,117 | 1,049,520 |  |  |
Private Education Loans allowance for losses, 2020 | 6 | 21,589 |  |  |
Private Education Loans allowance for losses, 2019 | 51,280 | 37,492 |  |  |
Private Education Loans allowance for losses, 2018 | 89,194 | 6,722 |  |  |
Private Education Loans allowance for losses, 2017 | 12,110 | 74 |  |  |
Private Education Loans allowance for losses, 2016 | 83 |  |  |  |
Private Education Loans allowance for losses | 152,673 | 65,877 |  |  |
Private Education Loans, net, 2020 | 34 | 383,567 |  |  |
Private Education Loans, net, 2019 | 313,904 | 503,425 |  |  |
Private Education Loans, net, 2018 | 366,577 | 95,742 |  |  |
Private Education Loans, net, 2017 | 66,225 | 909 |  |  |
Private Education Loans, net, 2016 | 704 |  |  |  |
Loans held for investment, net | $ 747,444 | $ 983,643 |  |  |
Percentage of Private Education Loans in repayment, 2020 | 0.00% | 1.10% |  |  |
Percentage of Private Education Loans in repayment, 2019 | 1.80% | 3.30% |  |  |
Percentage of Private Education Loans in repayment, 2018 | 3.30% | 2.80% |  |  |
Percentage of Private Education Loans in repayment, 2017 | 2.70% | 4.20% |  |  |
Percentage of Private Education Loans in repayment, 2016 | 0.00% |  |  |  |
Percentage of Private Education Loans in repayment | 2.60% | 2.40% |  |  |
Loans current, percentage | 97.40% | 97.60% |  |  |
Loans In Repayment In Percentage | 100.00% | 100.00% |  |  |
Loans current |  | $ 1,023,517 |  |  |
Personal Loans | Consumer Portfolio Segment | Loan delinquency 31-60 days |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | $ 0 |  |  |  |
2019 | 3,321 | 2,164 |  |  |
2018 | 7,448 | 6,213 |  |  |
2017 | 810 | 1,045 |  |  |
2016 | 0 | $ 13 |  |  |
2015 and Prior | $ 11,579 |  |  |  |
Loans delinquent | 1.30% | 0.90% |  |  |
Loans delinquent |  | $ 9,435 |  |  |
Personal Loans | Consumer Portfolio Segment | Loan delinquency 61-90 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | $ 0 |  |  |  |
2019 | 991 | 1,074 |  |  |
2018 | 2,663 | 5,148 |  |  |
2017 | 701 | 943 |  |  |
2016 | 0 | $ 7 |  |  |
2015 and Prior | $ 4,355 |  |  |  |
Loans delinquent | 0.50% | 0.70% |  |  |
Loans delinquent |  | $ 7,172 |  |  |
Personal Loans | Consumer Portfolio Segment | Loan delinquency greater than 90 days |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | $ 0 |  |  |  |
2019 | 2,034 | 1,322 |  |  |
2018 | 4,781 | 6,645 |  |  |
2017 | 636 | 895 |  |  |
2016 | 0 | $ 21 |  |  |
2015 and Prior | $ 7,451 |  |  |  |
Loans delinquent | 0.80% | 0.80% |  |  |
Loans delinquent |  | $ 8,883 |  |  |
Personal Loans | Loans In Forbearance | Consumer Portfolio Segment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
2020 | $ 0 |  |  |  |
2019 | 12,380 | 0 |  |  |
2018 | 7,137 | 0 |  |  |
2017 | 0 | 0 |  |  |
2016 | 0 | 0 |  |  |
2015 and Prior | $ 19,517 |  |  |  |
Total |  | $ 0 |  |  |

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