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Federal Home Loan Bank Advances - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
Advances from FHLB	$ 22,500us-gaap_FederalHomeLoanBankAdvancesLongTerm	$ 37,726us-gaap_FederalHomeLoanBankAdvancesLongTerm
Maturities from June 2014through January 2017, fixed rates, minimum	1.50%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeFrom
Maturities from June 2014through January 2017, fixed rates, maximum	4.25%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeTo
Maturities from June 2014through January 2017, fixed rates, averaging	2.24%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate
Maturities, year from	2015
Maturities, year to	2019
Outstanding letters of credit with FHLB	22,700us-gaap_LettersOfCreditOutstandingAmount	23,300us-gaap_LettersOfCreditOutstandingAmount
FHLB borrowings collateralized by residential mortgage loans	131,850us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	91,540us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
FHLB maximum borrowing capacity	124,741us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
FHLB remaining borrowing capacity	$ 36,841us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds

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Discloses the earliest year of maturity for the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Enter the last year of maturity for the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Discloses the lowest interest rate applicable to any of the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Discloses the highest interest rate applicable to any of the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Describes the weighted average interest rate applicable to the specific advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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

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Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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