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Long-Term Debt - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
FHLB advances outstanding	$ 5,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm	$ 5,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
Assets pledged associated with FHLB advances	5,700,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	5,100,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Available credit from the FHLB	$ 166,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity	$ 165,900,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity

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- Definition

Amount of the collateral pledged in support of federal home loan bank advances outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822



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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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- Definition

Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822



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-Publisher FASB

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-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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