Fair Value - Fair Value Hierarchy for Assets and Liabilities Not Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Financial assets:
Cash and cash equivalents	$ 28,701
Loans	871,802
Interest receivable	4,520
Federal Home Loan Bank stock	10,462
Bank-owned life insurance	15,621
Financial liabilities:
Deposits	1,046,165
Federal funds and overnight funds purchased	11,570
Federal Home Loan Bank borrowings	119,517
Junior subordinated debentures	2,193
Accrued interest payable	218
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	28,701
Interest receivable	4,520
Federal Home Loan Bank stock	10,462
Bank-owned life insurance	15,621
Financial liabilities:
Federal funds and overnight funds purchased	11,570
Accrued interest payable	218
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents
Loans
Interest receivable
Federal Home Loan Bank stock
Bank-owned life insurance
Financial liabilities:
Deposits	1,046,165
Federal funds and overnight funds purchased
Federal Home Loan Bank borrowings	119,517
Junior subordinated debentures	2,193
Accrued interest payable
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Loans	871,802
Financial liabilities:
Deposits
Federal Home Loan Bank borrowings
Junior subordinated debentures

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Interest receivable fair value disclosure.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 8

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- Definition

Amount of subordinated debt obligations (also known as subordinated loan, subordinated bond, subordinated debenture or junior debt) which has a priority ranking after other debts in a dissolution, measured at fair value.

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-Number AAG-DEP

-Paragraph 17

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