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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, 2016 USD ($) charge_off | Jun. 30, 2015 USD ($) charge_off | Jun. 30, 2016 USD ($) charge_off | Jun. 30, 2015 USD ($) charge_off
Allowance for Loan Losses |  |  |  |
Beginning balance | $ 126,249 | $ 89,805 | $ 112,507 | $ 83,842
Total provision | 41,377 | 15,558 | 75,537 | 32,176
Net charge-offs: |  |  |  |
Charge-offs | (24,250) | (13,757) | (43,637) | (23,618)
Recoveries | 3,082 | 1,780 | 4,125 | 3,168
Net charge-offs | (21,168) | (11,977) | (39,512) | (20,450)
Loan sales | (1,533) | (1,520) | (3,607) | (3,702)
Ending Balance | 144,925 | 91,866 | 144,925 | 91,866
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 63,370 | 32,446 | 63,370 | 32,446
Ending balance: collectively evaluated for impairment | 81,555 | 59,420 | 81,555 | 59,420
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 400,969 | 187,143 | 400,969 | 187,143
Ending balance: collectively evaluated for impairment | 12,951,257 | 10,304,670 | 12,951,257 | 10,304,670
FFELP Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Beginning balance | 3,629 | 4,569 | 3,691 | 5,268
Total provision | (985) | 466 | (664) | 901
Net charge-offs: |  |  |  |
Charge-offs | (347) | (479) | (730) | (1,613)
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | (347) | (479) | (730) | (1,613)
Loan sales | 0 | 0 | 0 | 0
Ending Balance | 2,297 | 4,556 | 2,297 | 4,556
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 2,297 | 4,556 | 2,297 | 4,556
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 1,061,517 | $ 1,178,876 | $ 1,061,517 | $ 1,178,876
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.18% | 0.22% | 0.18% | 0.37%
Allowance as a percentage of the ending total loan balance | 0.22% | 0.39% | 0.22% | 0.39%
Allowance as a percentage of the ending loans in repayment | 0.30% | 0.54% | 0.30% | 0.54%
Allowance coverage of net charge-offs (annualized) | charge_off | 1.65 | 2.38 | 1.57 | 1.41
Ending total loans, gross | $ 1,061,517 | $ 1,178,876 | $ 1,061,517 | $ 1,178,876
Average loans in repayment | 786,818 | 861,453 | 794,665 | 880,953
Ending loans in repayment | 773,321 | 836,545 | 773,321 | 836,545
Private Education Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Beginning balance | 122,620 | 85,236 | 108,816 | 78,574
Total provision | 42,362 | 15,092 | 76,201 | 31,275
Net charge-offs: |  |  |  |
Charge-offs | (23,903) | (13,278) | (42,907) | (22,005)
Recoveries | 3,082 | 1,780 | 4,125 | 3,168
Net charge-offs | (20,821) | (11,498) | (38,782) | (18,837)
Loan sales | (1,533) | (1,520) | (3,607) | (3,702)
Ending Balance | 142,628 | 87,310 | 142,628 | 87,310
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 63,370 | 32,446 | 63,370 | 32,446
Ending balance: collectively evaluated for impairment | 79,258 | 54,864 | 79,258 | 54,864
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 400,969 | 187,143 | 400,969 | 187,143
Ending balance: collectively evaluated for impairment | $ 11,889,740 | $ 9,125,794 | $ 11,889,740 | $ 9,125,794
Net charge-offs as a percentage of average loans in repayment (annualized) | 1.05% | 0.81% | 1.01% | 0.66%
Allowance as a percentage of the ending total loan balance | 1.16% | 0.94% | 1.16% | 0.94%
Allowance as a percentage of the ending loans in repayment | 1.78% | 1.54% | 1.78% | 1.54%
Allowance coverage of net charge-offs (annualized) | charge_off | 1.71 | 1.90 | 1.84 | 2.32
Ending total loans, gross | $ 12,290,709 | $ 9,312,937 | $ 12,290,709 | $ 9,312,937
Average loans in repayment | 7,894,340 | 5,712,559 | 7,695,889 | 5,667,912
Ending loans in repayment | $ 8,029,034 | $ 5,666,645 | $ 8,029,034 | $ 5,666,645

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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=66008989&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=66008989&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=66008989&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=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually 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=66008989&loc=SL6953423-111524 + Details
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