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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Allowance for Loan Losses |  |
Beginning balance | $ 112,507 | $ 83,842
Total provision | 34,160 | 16,618
Net charge-offs: |  |
Charge-offs | (19,387) | (9,861)
Recoveries | 1,044 | 1,387
Net charge-offs | (18,343) | (8,474)
Loan sales | (2,075) | (2,181)
Ending Balance | 126,249 | 89,805
Allowance: |  |
Ending balance: individually evaluated for impairment | 49,212 | 20,105
Ending balance: collectively evaluated for impairment | 77,037 | 69,700
Loans: |  |
Ending balance: individually evaluated for impairment | 318,094 | 122,120
Ending balance: collectively evaluated for impairment | 12,881,802 | 10,855,618
FFELP Loans |  |
Allowance for Loan Losses |  |
Beginning balance | 3,691 | 5,268
Total provision | 321 | 435
Net charge-offs: |  |
Charge-offs | (383) | (1,134)
Recoveries | 0 | 0
Net charge-offs | (383) | (1,134)
Loan sales | 0 | 0
Ending Balance | 3,629 | 4,569
Allowance: |  |
Ending balance: individually evaluated for impairment | 0 | 0
Ending balance: collectively evaluated for impairment | 3,629 | 4,569
Loans: |  |
Ending balance: individually evaluated for impairment | 0 | 0
Ending balance: collectively evaluated for impairment | $ 1,088,026 | $ 1,208,977
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.19% | 0.50%
Allowance as a percentage of the ending total loan balance | 0.33% | 0.38%
Allowance as a percentage of the ending loans in repayment | 0.45% | 0.52%
Allowance coverage of net charge-offs (annualized) | 2.37 | 1.01
Ending total loans, gross | $ 1,088,026 | $ 1,208,977
Average loans in repayment | 804,690 | 898,360
Ending loans in repayment | 803,378 | 872,579
Private Education Loans |  |
Allowance for Loan Losses |  |
Beginning balance | 108,816 | 78,574
Total provision | 33,839 | 16,183
Net charge-offs: |  |
Charge-offs | (19,004) | (8,727)
Recoveries | 1,044 | 1,387
Net charge-offs | (17,960) | (7,340)
Loan sales | (2,075) | (2,181)
Ending Balance | 122,620 | 85,236
Allowance: |  |
Ending balance: individually evaluated for impairment | 49,212 | 20,105
Ending balance: collectively evaluated for impairment | 73,408 | 65,131
Loans: |  |
Ending balance: individually evaluated for impairment | 318,094 | 122,120
Ending balance: collectively evaluated for impairment | $ 11,793,776 | $ 9,646,641
Net charge-offs as a percentage of average loans in repayment (annualized) | 0.95% | 0.51%
Allowance as a percentage of the ending total loan balance | 1.01% | 0.87%
Allowance as a percentage of the ending loans in repayment | 1.56% | 1.42%
Allowance coverage of net charge-offs (annualized) | 1.71 | 2.90
Ending total loans, gross | $ 12,111,870 | $ 9,768,761
Average loans in repayment | 7,534,234 | 5,705,067
Ending loans in repayment | $ 7,843,076 | $ 5,995,121

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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=49124121&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=49124121&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=49124121&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=49124121&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=49124121&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=49124121&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=49124121&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 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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