Loans, Notes and Certificates, and Loan Servicing Rights - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Number of days overdue to be considered a non-accrual loan	120 days
Debt instrument, interest rate, effective percentage rate range, minimum	4.99%	5.79%
Debt instrument, interest rate, effective percentage rate range, maximum	29.90%	29.90%
Minimum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Notes and certificates term	12 months	12 months
Maximum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Notes and certificates term	60 months	60 months
Loan Servicing Rights
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Payment frequency for the debt instrument	monthly	monthly
Debt instrument, interest rate, effective percentage rate range, minimum	2.99%	5.90%
Debt instrument, interest rate, effective percentage rate range, maximum	33.15%	33.15%
Debt instrument, maturity date, description	September 2022	December 2019
Principal balance of underlying loan servicing rights	$ 3,548	$ 1,872
Loan Servicing Rights \| Minimum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Notes and certificates term	3 months	12 months
Loan Servicing Rights \| Maximum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Notes and certificates term	84 months	60 months

Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]

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- Definition

Long Term Notes Maturity Term

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- Definition

Non-Accrual Loans, Number of Days

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- Definition

Principal balances of underlying loans for the loan servicing rights.

+ References

No definition available.

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Publisher SEC

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-Number 210

-Section 02

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- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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