Amortized Cost and Fair Values of Securities with Gross Unrealized Gains and Losses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 276,326	$ 328,001
Gross Unrealized Gains	9,168	7,986
Gross Unrealized Losses	(4,297)	(5,109)
Fair Value	281,197	330,878
Mortgage-backed securities, Government sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	121,260	198,039
Gross Unrealized Gains	5,115	4,813
Gross Unrealized Losses		(6)
Fair Value	126,375	202,846
Collateralized mortgage obligations, Government sponsored agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	114,782	97,098
Gross Unrealized Gains	3,463	2,963
Gross Unrealized Losses	(10)
Fair Value	118,235	100,061
Federal agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,000	2,000
Gross Unrealized Gains	8	2
Gross Unrealized Losses	(2)
Fair Value	13,006	2,002
Municipals
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,129	3,364
Gross Unrealized Gains	151	208
Gross Unrealized Losses	(16)	(14)
Fair Value	3,264	3,558
Small Business Administration
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8	12
Fair Value	8	12
Corporate obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,147	27,488
Gross Unrealized Gains	431
Gross Unrealized Losses	(4,269)	(5,089)
Fair Value	$ 20,309	$ 22,399

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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