Amortized Costs and Fair Values of Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 57,929	$ 58,011
Gross Unrealized Gains	2,100	1,818
Gross Unrealized Losses	(2,525)	(2,493)
Estimated Fair Value	57,504	57,336
US Government Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,414	24,030
Gross Unrealized Gains	445	576
Estimated Fair Value	23,859	24,606
Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,456	12,932
Gross Unrealized Gains	368	258
Gross Unrealized Losses	(15)	(11)
Estimated Fair Value	13,809	13,179
Collateralized Mortgage Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,872	7,823
Gross Unrealized Gains	76	69
Estimated Fair Value	7,948	7,892
Asset Backed Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,578	2,548
Gross Unrealized Losses	(2,510)	(2,480)
Estimated Fair Value	68	68
Municipal Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,609	10,678
Gross Unrealized Gains	1,211	915
Gross Unrealized Losses		(2)
Estimated Fair Value	$ 11,820	$ 11,591

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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