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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) charge_off | Sep. 30, 2015 USD ($) charge_off | Sep. 30, 2016 USD ($) charge_off | Sep. 30, 2015 USD ($) charge_off
Allowance for Loan Losses |  |  |  |
Beginning balance | $ 144,925 | $ 91,866 | $ 112,507 | $ 83,842
Total provision | 40,770 | 27,497 | 116,307 | 59,673
Net charge-offs: |  |  |  |
Charge-offs | (22,428) | (14,650) | (66,065) | (38,269)
Recoveries | 2,973 | 1,361 | 7,098 | 4,529
Net charge-offs | (19,455) | (13,289) | (58,967) | (33,740)
Loan sales | (1,401) | (1,871) | (5,008) | (5,572)
Ending Balance | 164,839 | 104,203 | 164,839 | 104,203
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 77,521 | 43,001 | 77,521 | 43,001
Ending balance: collectively evaluated for impairment | 87,318 | 61,202 | 87,318 | 61,202
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 503,632 | 231,286 | 503,632 | 231,286
Ending balance: collectively evaluated for impairment | 14,378,559 | 11,752,570 | 14,378,559 | 11,752,570
FFELP Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Beginning balance | 2,297 | 4,556 | 3,691 | 5,268
Total provision | 268 | 143 | (396) | 1,044
Net charge-offs: |  |  |  |
Charge-offs | (356) | (529) | (1,086) | (2,142)
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | (356) | (529) | (1,086) | (2,142)
Loan sales | 0 | 0 | 0 | 0
Ending Balance | 2,209 | 4,170 | 2,209 | 4,170
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 2,209 | 4,170 | 2,209 | 4,170
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | $ 1,033,929 | $ 1,143,595 | $ 1,033,929 | $ 1,143,595
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.18% | 0.25% | 0.18% | 0.33%
Allowance as a percentage of the ending total loan balance | 0.21% | 0.36% | 0.21% | 0.36%
Allowance as a percentage of the ending loans in repayment | 0.28% | 0.50% | 0.28% | 0.50%
Allowance coverage of net charge-offs (annualized) | charge_off | 1.55 | 1.97 | 1.53 | 1.46
Ending total loans, gross | $ 1,033,929 | $ 1,143,595 | $ 1,033,929 | $ 1,143,595
Average loans in repayment | 791,296 | 839,090 | 795,452 | 868,649
Ending loans in repayment | 795,665 | 836,585 | 795,665 | 836,585
Private Education Loans |  |  |  |
Allowance for Loan Losses |  |  |  |
Beginning balance | 142,628 | 87,310 | 108,816 | 78,574
Total provision | 40,502 | 27,354 | 116,703 | 58,629
Net charge-offs: |  |  |  |
Charge-offs | (22,072) | (14,121) | (64,979) | (36,127)
Recoveries | 2,973 | 1,361 | 7,098 | 4,529
Net charge-offs | (19,099) | (12,760) | (57,881) | (31,598)
Loan sales | (1,401) | (1,871) | (5,008) | (5,572)
Ending Balance | 162,630 | 100,033 | 162,630 | 100,033
Allowance: |  |  |  |
Ending balance: individually evaluated for impairment | 77,521 | 43,001 | 77,521 | 43,001
Ending balance: collectively evaluated for impairment | 85,109 | 57,032 | 85,109 | 57,032
Loans: |  |  |  |
Ending balance: individually evaluated for impairment | 503,632 | 231,286 | 503,632 | 231,286
Ending balance: collectively evaluated for impairment | $ 13,344,630 | $ 10,608,975 | $ 13,344,630 | $ 10,608,975
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.91% | 0.83% | 0.97% | 0.72%
Allowance as a percentage of the ending total loan balance | 1.17% | 0.92% | 1.17% | 0.92%
Allowance as a percentage of the ending loans in repayment | 1.83% | 1.50% | 1.83% | 1.50%
Allowance coverage of net charge-offs (annualized) | charge_off | 2.13 | 1.96 | 2.11 | 2.37
Ending total loans, gross | $ 13,848,262 | $ 10,840,261 | $ 13,848,262 | $ 10,840,261
Average loans in repayment | 8,420,625 | 6,118,678 | 7,952,469 | 5,848,345
Ending loans in repayment | $ 8,905,812 | $ 6,657,228 | $ 8,905,812 | $ 6,657,228

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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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