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Off Balance Sheet Activities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Commitments to make loans periods	60 days or less
Minimum [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Fixed Interest rate loan	1.69%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember	2.15%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Fixed rate loan Maturities range	3 months	3 months
Maximum [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]
Fixed Interest rate loan	18.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember	18.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember
Fixed rate loan Maturities range	20 years	20 years

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- Definition

Fixed rate loan maturities range.

+ References

No definition available.

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- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823



Reference 3: 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)(3))

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

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ 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))

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

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