Fair Value - Assets and Liabilities Measured At Fair Value On a Recurring Basis, Including Financial Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial Assets:
Total securities available for sale	$ 14,300	$ 18,516
Loans held for sale	2,571	1,210
Fair Value, Measurements, Recurring [Member] \| Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Total securities available for sale	14,300	18,516
Loans held for sale	2,571	1,210
Fair Value, Measurements, Recurring [Member] \| Issued by U.S. government-sponsored entities and agencies [Member] \| Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Total securities available for sale	1,671	1,673
Fair Value, Measurements, Recurring [Member] \| Collateralized mortgage obligations [Member] \| Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Total securities available for sale	12,629	16,843
Fair Value, Measurements, Recurring [Member] \| Yield maintenance provisions (embedded derivatives) [Member] \| Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Assets	1,054	999
Fair Value, Measurements, Recurring [Member] \| Interest rate lock commitments [Member] \| Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Assets	45	39
Fair Value, Measurements, Recurring [Member] \| Interest Rate Swap [Member] \| Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member]
Financial Liabilities:
Interest-rate swaps	$ 1,054	$ 999

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 represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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