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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) charge_off | Mar. 31, 2017 USD ($) charge_off
Allowance for Loan Losses |  |
Allowance at beginning of period | $ 251,475 | $ 184,701
Total provision | 55,549 | 26,792
Net charge-offs: |  |
Charge-offs | (38,803) | (26,445)
Recoveries | 5,118 | 3,259
Net charge-offs | (33,685) | (23,186)
Loan sales | (1,216) | (1,221)
Allowance at end of period | 272,123 | 187,086
Allowance: |  |
Ending balance: individually evaluated for impairment | 101,824 | 87,150
Ending balance: collectively evaluated for impairment | 170,299 | 99,936
Loans: |  |
Ending balance: individually evaluated for impairment | 1,043,103 | 701,860
Ending balance: collectively evaluated for impairment | 19,334,407 | 15,997,889
FFELP Loans |  |
Allowance for Loan Losses |  |
Allowance at beginning of period | 1,132 | 2,171
Total provision | 231 | (316)
Net charge-offs: |  |
Charge-offs | (250) | (218)
Recoveries | 0 | 0
Net charge-offs | (250) | (218)
Loan sales | 0 | 0
Allowance at end of period | 1,113 | 1,637
Allowance: |  |
Ending balance: individually evaluated for impairment | 0 | 0
Ending balance: collectively evaluated for impairment | 1,113 | 1,637
Loans: |  |
Ending balance: individually evaluated for impairment | 0 | 0
Ending balance: collectively evaluated for impairment | $ 907,842 | $ 989,393
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.14% | 0.11%
Allowance as a percentage of the ending total loan balance | 0.12% | 0.17%
Allowance as a percentage of the ending loans in repayment | 0.16% | 0.22%
Allowance coverage of net charge-offs (annualized) | charge_off | 1.11 | 1.88
Ending total loans, gross | $ 907,842 | $ 989,393
Average loans in repayment | 718,311 | 771,435
Ending loans in repayment | 702,965 | 757,052
Private Education Loans |  |
Allowance for Loan Losses |  |
Allowance at beginning of period | 243,715 | 182,472
Total provision | 41,870 | 26,820
Net charge-offs: |  |
Charge-offs | (37,353) | (26,227)
Recoveries | 5,087 | 3,259
Net charge-offs | (32,266) | (22,968)
Loan sales | (1,216) | (1,221)
Allowance at end of period | 252,103 | 185,103
Allowance: |  |
Ending balance: individually evaluated for impairment | 101,824 | 87,150
Ending balance: collectively evaluated for impairment | 150,279 | 97,953
Loans: |  |
Ending balance: individually evaluated for impairment | 1,043,103 | 701,860
Ending balance: collectively evaluated for impairment | $ 17,750,909 | $ 14,952,994
Net charge-offs as a percentage of average loans in repayment (annualized) | 1.01% | 0.89%
Allowance as a percentage of the ending total loan balance | 1.34% | 1.18%
Allowance as a percentage of the ending loans in repayment | 1.95% | 1.76%
Allowance coverage of net charge-offs (annualized) | charge_off | 1.95 | 2.01
Ending total loans, gross | $ 18,794,012 | $ 15,654,854
Average loans in repayment | 12,747,929 | 10,265,530
Ending loans in repayment | 12,958,742 | 10,526,782
Personal Loans |  |
Allowance for Loan Losses |  |
Allowance at beginning of period | 6,628 | 58
Total provision | 13,448 | 288
Net charge-offs: |  |
Charge-offs | (1,200) | 0
Recoveries | 31 | 0
Net charge-offs | (1,169) |
Loan sales | 0 | 0
Allowance at end of period | 18,907 | 346
Allowance: |  |
Ending balance: individually evaluated for impairment | 0 | 0
Ending balance: collectively evaluated for impairment | 18,907 | 346
Loans: |  |
Ending balance: individually evaluated for impairment | 0 | 0
Ending balance: collectively evaluated for impairment | $ 675,656 | $ 55,502
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.88% | 0.00%
Allowance as a percentage of the ending total loan balance | 2.80% | 0.62%
Allowance as a percentage of the ending loans in repayment | 2.80% | 0.62%
Allowance coverage of net charge-offs (annualized) | charge_off | 4.04 | 0.00
Ending total loans, gross | $ 675,656 | $ 55,502
Average loans in repayment | 531,889 | 35,830
Ending loans in repayment | $ 675,656 | $ 55,502

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- Definition Allowance as a percentage of the ending loans in repayment. + References No definition available. + Details
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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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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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