Fair Value Measurements and Disclosures - Carrying Value and Estimated Fair Value of Financial Assets and Financial Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial Assets:
Cash and due from banks	$ 52,338	$ 54,020
Available for sale securities	282,318	258,876
Held to maturity securities	9,732	7,125
Held to maturity securities, Fair Value	9,278	7,225
Other investments	3,229	3,450
Other investments, Fair Value	3,229	3,450
Federal Home Loan Bank stock	651	2,380
Federal Home Loan Bank stock, Fair Value	651	2,380
Loans, net	390,948	422,226
Loans, net, Fair Value	397,561	425,627
Other real estate	6,825	7,008
Other real estate, Fair Value	6,825	7,008
Cash surrender value of life insurance	17,163	16,861
Cash surrender value of life insurance, Fair Value	17,163	16,861
Deposits:
Non-interest bearing	120,365	102,609
Non-interest bearing, Fair Value	120,365	102,609
Interest bearing, Fair Value	362,902	376,209
Federal funds purchased and securities sold under agreements to repurchase	191,371	194,234
Federal funds purchased and securities sold under agreements to repurchase, Fair Value	191,371	194,234
Borrowings from Federal Home Loan Bank	9,725	10,271
Carrying Amount [Member]
Financial Assets:
Cash and due from banks	52,338	54,020
Available for sale securities	282,318	258,876
Held to maturity securities	9,732	7,125
Other investments	3,229	3,450
Federal Home Loan Bank stock	651	2,380
Loans, net	390,948	422,226
Other real estate	6,825	7,008
Cash surrender value of life insurance	17,163	16,861
Deposits:
Non-interest bearing	120,365	102,609
Interest bearing	360,240	373,110
Federal funds purchased and securities sold under agreements to repurchase	191,371	194,234
Borrowings from Federal Home Loan Bank		7,912
Borrowings from Federal Home Loan Bank	7,799
Level 1 [Member]
Financial Assets:
Cash and due from banks	52,338	54,020
Available for sale securities
Held to maturity securities, Fair Value
Other investments, Fair Value	3,229	3,450
Federal Home Loan Bank stock, Fair Value
Loans, net, Fair Value
Other real estate
Other real estate, Fair Value
Cash surrender value of life insurance, Fair Value
Deposits:
Non-interest bearing, Fair Value	120,365	102,609
Interest bearing, Fair Value
Federal funds purchased and securities sold under agreements to repurchase, Fair Value	191,371	194,234
Borrowings from Federal Home Loan Bank
Level 2 [Member]
Financial Assets:
Cash and due from banks
Available for sale securities	282,318	258,876
Held to maturity securities, Fair Value	9,278	7,225
Other investments, Fair Value
Federal Home Loan Bank stock, Fair Value	651	2,380
Loans, net, Fair Value
Other real estate
Other real estate, Fair Value
Cash surrender value of life insurance, Fair Value
Deposits:
Non-interest bearing, Fair Value
Interest bearing, Fair Value
Federal funds purchased and securities sold under agreements to repurchase, Fair Value
Borrowings from Federal Home Loan Bank	9,725	10,271
Level 3 [Member]
Financial Assets:
Cash and due from banks
Available for sale securities
Held to maturity securities, Fair Value
Other investments, Fair Value
Federal Home Loan Bank stock, Fair Value
Loans, net, Fair Value	397,561	425,627
Other real estate	6,825	7,008	6,153
Other real estate, Fair Value	6,825	7,008
Cash surrender value of life insurance, Fair Value	17,163	16,861
Deposits:
Non-interest bearing, Fair Value
Interest bearing, Fair Value	362,902	376,209
Federal funds purchased and securities sold under agreements to repurchase, Fair Value
Borrowings from Federal Home Loan Bank

Borrowings from Federal Home Loan Bank

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Interest bearing deposit liabilities fair value disclosure.

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Noninterest bearing deposit liabilities domestic fair value disclosure.

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Other investments fair value disclosure.

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Real estate acquired through foreclosure fair value disclosure.

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

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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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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 portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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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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Fair value of investments in debt securities classified as held-to-maturity.

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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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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 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 of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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Other investments not otherwise specified in the taxonomy.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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