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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) charge_off | Jun. 30, 2016 USD ($) charge_off | Jun. 30, 2017 USD ($) charge_off | Jun. 30, 2016 USD ($) charge_off
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | $ 187,086 | $ 126,249 | $ 184,701 | $ 112,507
Total provision | 49,886 | 41,377 | 76,678 | 75,537
Net charge-offs: |  |  |  |
Charge-offs | (33,007) | (24,250) | (59,452) | (43,637)
Recoveries | 4,396 | 3,082 | 7,655 | 4,125
Net charge-offs | (28,611) | (21,168) | (51,797) | (39,512)
Loan sales | (913) | (1,533) | (2,134) | (3,607)
Allowance at end of period | 207,448 | 144,925 | 207,448 | 144,925
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 95,177 | 63,370 | 95,177 | 63,370
Ending balance: collectively evaluated for impairment | 112,271 | 81,555 | 112,271 | 81,555
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 803,456 | 400,969 | 803,456 | 400,969
Ending balance: collectively evaluated for impairment | 15,912,746 | 12,951,257 | 15,912,746 | 12,951,257
FFELP Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 1,637 | 3,629 | 2,171 | 3,691
Total provision | 228 | (985) | (88) | (664)
Net charge-offs: |  |  |  |
Charge-offs | (259) | (347) | (477) | (730)
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | (259) | (347) | (477) | (730)
Loan sales | 0 | 0 | 0 | 0
Allowance at end of period | 1,606 | 2,297 | 1,606 | 2,297
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 1,606 | 2,297 | 1,606 | 2,297
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 967,237 | $ 1,061,517 | $ 967,237 | $ 1,061,517
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.14% | 0.18% | 0.12% | 0.18%
Allowance as a percentage of the ending total loan balance | 0.17% | 0.22% | 0.17% | 0.22%
Allowance as a percentage of the ending loans in repayment | 0.21% | 0.30% | 0.21% | 0.30%
Allowance coverage of net charge-offs (annualized) | charge_off | 1.55 | 1.65 | 1.68 | 1.57
Ending total loans, gross | $ 967,237 | $ 1,061,517 | $ 967,237 | $ 1,061,517
Average loans in repayment | 757,186 | 786,818 | 765,347 | 794,665
Ending loans in repayment | 765,980 | 773,321 | 765,980 | 773,321
Private Education Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 185,103 | 122,620 | 182,472 | 108,816
Total provision | 49,166 | 42,362 | 75,986 | 76,201
Net charge-offs: |  |  |  |
Charge-offs | (32,728) | (23,903) | (58,955) | (42,907)
Recoveries | 4,396 | 3,082 | 7,655 | 4,125
Net charge-offs | (28,332) | (20,821) | (51,300) | (38,782)
Loan sales | (913) | (1,533) | (2,134) | (3,607)
Allowance at end of period | 205,024 | 142,628 | 205,024 | 142,628
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 95,177 | 63,370 | 95,177 | 63,370
Ending balance: collectively evaluated for impairment | 109,847 | 79,258 | 109,847 | 79,258
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 803,456 | 400,969 | 803,456 | 400,969
Ending balance: collectively evaluated for impairment | $ 14,876,001 | $ 11,889,740 | $ 14,876,001 | $ 11,889,740
Net charge-offs as a percentage of average loans in repayment (annualized) | 1.08% | 1.05% | 0.99% | 1.01%
Allowance as a percentage of the ending total loan balance | 1.31% | 1.16% | 1.31% | 1.16%
Allowance as a percentage of the ending loans in repayment | 1.93% | 1.78% | 1.93% | 1.78%
Allowance coverage of net charge-offs (annualized) | charge_off | 1.81 | 1.71 | 2.00 | 1.84
Ending total loans, gross | $ 15,679,457 | $ 12,290,709 | $ 15,679,457 | $ 12,290,709
Average loans in repayment | 10,523,225 | 7,894,340 | 10,375,463 | 7,695,889
Ending loans in repayment | 10,615,105 | $ 8,029,034 | 10,615,105 | $ 8,029,034
Personal Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Allowance at beginning of period | 346 |  | 58 |
Total provision | 492 |  | 780 |
Net charge-offs: |  |  |  |
Charge-offs | (20) |  | (20) |
Recoveries | 0 |  | 0 |
Net charge-offs | (20) |  | (20) |
Loan sales | 0 |  | 0 |
Allowance at end of period | 818 |  | 818 |
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 0 |  | 0 |
Ending balance: collectively evaluated for impairment | 818 |  | 818 |
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 0 |  | 0 |
Ending balance: collectively evaluated for impairment | $ 69,508 |  | $ 69,508 |
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.13% |  | 0.08% |
Allowance as a percentage of the ending total loan balance | 1.18% |  | 1.18% |
Allowance as a percentage of the ending loans in repayment | 1.18% |  | 1.18% |
Allowance coverage of net charge-offs (annualized) | charge_off | 10.23 |  | 20.45 |
Ending total loans, gross | $ 69,508 |  | $ 69,508 |
Average loans in repayment | 61,439 |  | 47,654 |
Ending loans in repayment | $ 69,508 |  | $ 69,508 |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of reduction of allowance reserve for credit loss arising from sale of loan and lease portfolios. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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