Fair Value Measurement - Carrying Amount and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from financial institutions, Carrying value	$ 35,092	$ 29,858	$ 50,834	$ 34,186
Securities available for sale, Carrying value	197,429	197,905
Other securities, Carrying value	13,261	12,586
Loans, held for sale, Carrying value	4,034	2,410
Loans, net of allowance for loan losses, Carrying value	988,210	900,589
Bank owned life insurance, Carrying value	19,870	19,637
Accrued interest receivable, Carrying value	3,987	3,852
Fair value swap asset, Carrying value	1,671	1,721
Nonmaturing deposits, Carrying value	842,246	748,948
Time deposits, Carrying value	233,560	219,970
Federal Home Loan Bank advances, Carrying value	55,300	65,200
Securities sold under agreement to repurchase, Carrying value	17,460	21,613
Subordinated debentures, Carrying value	29,427	29,427
Accrued interest payable, Carrying value	136	126
Fair value swap liability, Carrying value	1,671	1,721
Cash and due from financial institutions, Fair value	35,092	29,858
Securities available for sale, Fair value	197,429	197,905
Other securities, Fair value	13,261	12,586
Loans, held for sale, Fair value	4,034	2,410
Loans, net of allowance for loan losses, Fair value	994,973	908,118
Bank owned life insurance, Fair value	19,870	19,637
Accrued interest receivable, Fair value	3,987	3,852
Fair value swap asset, Fair value	1,671	1,721
Nonmaturing deposits, Fair value	842,246	748,948
Time deposits, Fair value	234,387	221,263
Federal Home Loan Bank advances, Fair value	55,381	65,399
Securities sold under agreement to repurchase, Fair value	17,460	21,613
Subordinated debentures, Fair value	23,965	24,688
Accrued interest payable, Fair value	136	126
Fair value swap liability, Fair value	1,671	1,721
(Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from financial institutions, Fair value	35,092	29,858
Other securities, Fair value	13,261	12,586
Loans, held for sale, Fair value	4,034	2,410
Bank owned life insurance, Fair value	19,870	19,637
Accrued interest receivable, Fair value	3,987	3,852
Nonmaturing deposits, Fair value	842,246	748,948
Securities sold under agreement to repurchase, Fair value	17,460	21,613
Accrued interest payable, Fair value	136	126
(Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale, Carrying value	197,429	197,905
Fair value swap asset, Carrying value	1,671	1,721
Securities available for sale, Fair value	197,429	197,905
Fair value swap asset, Fair value	1,671	1,721
Fair value swap liability, Fair value	1,671	1,721
(Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net of allowance for loan losses, Fair value	994,973	908,118
Time deposits, Fair value	234,387	221,263
Federal Home Loan Bank advances, Fair value	55,381	65,399
Subordinated debentures, Fair value	$ 23,965	$ 24,688

Accrued interest payable fair value disclosure.

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Accrued interest receivable fair value disclosure.

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No definition available.

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The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits.

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Fair value portion as of the balance sheet date for the aggregate of Federal Home Loan Bank (FHLB) borrowings owed by the reporting entity.

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The carrying amount of non maturing deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits and negotiable orders of withdrawal (NOW).

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Fair value portion of non maturing deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits and negotiable orders of withdrawal (NOW).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock, Federal Reserve Bank (FRB) and others.

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Fair value portion of time deposit liabilities held by the entity.

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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 liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 interest payable on debt, including, but not limited to, trade payables.

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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. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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Amount of other investments not classified as trading, available-for-sale or held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

+ Details

Name:	us-gaap_TimeDeposits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: