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Fair Value of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 38,676us-gaap_CashAndDueFromBanks	$ 43,476us-gaap_CashAndDueFromBanks
Investment securities, held to maturity	164,282us-gaap_HeldToMaturitySecurities	165,767us-gaap_HeldToMaturitySecurities
Loans held for sale	6,229us-gaap_LoansReceivableHeldForSaleNet	6,143us-gaap_LoansReceivableHeldForSaleNet
Loans excluding loan level hedges, net	1,448,596us-gaap_LoansReceivableNet	1,365,885us-gaap_LoansReceivableNet
Stock in FHLB and FRB	11,348us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock	11,348us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock
Interest receivable	8,431us-gaap_InterestReceivable	8,246us-gaap_InterestReceivable
Liabilities
Non-interest bearing deposits	285,181us-gaap_NoninterestBearingDepositLiabilities	267,667us-gaap_NoninterestBearingDepositLiabilities
Subordinated debentures	32,680us-gaap_SubordinatedDebt	32,642us-gaap_SubordinatedDebt
Interest payable	504us-gaap_InterestPayableCurrentAndNoncurrent	497us-gaap_InterestPayableCurrentAndNoncurrent
Carrying Amount [Member]
Assets
Cash and due from banks	38,676us-gaap_CashAndDueFromBanks / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	43,476us-gaap_CashAndDueFromBanks / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Investment securities, held to maturity	164,282us-gaap_HeldToMaturitySecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	165,767us-gaap_HeldToMaturitySecurities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans held for sale	6,229us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	6,143us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans excluding loan level hedges, net	1,340,342us-gaap_LoansReceivableNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	1,260,608us-gaap_LoansReceivableNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Stock in FHLB and FRB	11,348us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	11,348us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Interest receivable	8,431us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	8,246us-gaap_InterestReceivable / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Liabilities
Non-interest bearing deposits	285,181us-gaap_NoninterestBearingDepositLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	267,667us-gaap_NoninterestBearingDepositLiabilities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Interest-bearing deposits	1,179,915us-gaap_InterestBearingDepositLiabilitiesDomestic / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	1,214,652us-gaap_InterestBearingDepositLiabilitiesDomestic / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Borrowings	440,415us-gaap_OtherBorrowings / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	351,198us-gaap_OtherBorrowings / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Subordinated debentures	32,680us-gaap_SubordinatedDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	32,642us-gaap_SubordinatedDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Interest payable	504us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	497us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Cash and due from banks	38,676us-gaap_CashAndDueFromBanks / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	43,476us-gaap_CashAndDueFromBanks / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Liabilities
Non-interest bearing deposits	285,181us-gaap_NoninterestBearingDepositLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	267,667us-gaap_NoninterestBearingDepositLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2) [Member]
Assets
Investment securities, held to maturity	171,405us-gaap_HeldToMaturitySecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	169,904us-gaap_HeldToMaturitySecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Stock in FHLB and FRB	11,348us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	11,348us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Interest receivable	8,431us-gaap_InterestReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	8,246us-gaap_InterestReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Liabilities
Interest-bearing deposits	1,134,694us-gaap_InterestBearingDepositLiabilitiesDomestic / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	1,158,912us-gaap_InterestBearingDepositLiabilitiesDomestic / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Borrowings	438,547us-gaap_OtherBorrowings / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	348,597us-gaap_OtherBorrowings / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Subordinated debentures	32,674us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	32,669us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Interest payable	504us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	497us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3) [Member]
Assets
Loans held for sale	6,229us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	6,143us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Loans excluding loan level hedges, net	$ 1,379,815us-gaap_LoansReceivableNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 1,295,133us-gaap_LoansReceivableNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits.

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Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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