Major Components of Securities Available for Sale and Comparison of Amortized Costs, Estimated Fair Market Values, and Gross Unrealized Gains and Losses (Detail) (USD $)	Jun. 30, 2012		Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 100,992,000		$ 149,987,000
Gross Unrealized Gain	327,000		726,000
Gross Unrealized Loss	(2,208,000)		(2,804,000)
Estimated Fair Value	99,111,000		147,909,000
Mortgage-backed securities issued by U.S. Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	91,031,000	[1]	133,859,000
Gross Unrealized Gain	327,000	[1]	630,000
Gross Unrealized Loss	(19,000)	[1]	(363,000)
Estimated Fair Value	91,339,000	[1]	134,126,000
Total
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	91,031,000
Gross Unrealized Gain	327,000
Gross Unrealized Loss	(19,000)
Estimated Fair Value	91,339,000
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	470,000		6,389,000
Gross Unrealized Gain			96,000
Gross Unrealized Loss			(42,000)
Estimated Fair Value	470,000		6,443,000
Collateralized mortgage obligations issued by non-agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,819,000	[1]	3,040,000
Gross Unrealized Loss	(179,000)	[1]	(455,000)
Estimated Fair Value	2,640,000	[1]	2,585,000
Asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,247,000	[2]	2,324,000
Gross Unrealized Loss	(2,010,000)	[2]	(1,944,000)
Estimated Fair Value	237,000	[2]	380,000
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,425,000	[3]	4,375,000
Estimated Fair Value	$ 4,425,000	[3]	$ 4,375,000

[1] Secured by closed-end first lien 1-4 family residential mortgages.

[2] Comprised of a security that represents an interest in a pool of trust preferred securities issued by U.S.-based banks and insurance companies

[3] Consists primarily of mutual fund investments in closed-end first lien 1-4 family residential mortgages.