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Investment Securities (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Investment [Line Items]
Amortized Cost	$ 122,437,000	$ 108,921,000
Gross Unrealized Gains	2,747,000	2,658,000
Gross Unrealized Losses	155,000	139,000
Fair Value	125,029,000	111,440,000
Amortized Cost	14,000	16,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	14,000	16,000
Agency mortgage-backed securities
Investment [Line Items]
Amortized Cost	18,784,000	11,689,000
Gross Unrealized Gains	496,000	542,000
Gross Unrealized Losses	17,000	11,000
Fair Value	19,263,000	12,220,000
Amortized Cost	14,000	16,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	14,000	16,000
Agency Collateralized Mortgage Obligations
Investment [Line Items]
Amortized Cost	26,500,000	23,196,000
Gross Unrealized Gains	208,000	152,000
Gross Unrealized Losses	47,000	60,000
Fair Value	26,661,000	23,288,000
Collateralized Mortgage Obligations Issued By Private Enterprise
Investment [Line Items]
Amortized Cost	720,000	896,000
Gross Unrealized Gains	13,000	16,000
Gross Unrealized Losses	49,000	32,000
Fair Value	684,000	880,000
Agency notes and bonds
Investment [Line Items]
Amortized Cost	43,768,000	41,971,000
Gross Unrealized Gains	376,000	395,000
Gross Unrealized Losses	7,000	3,000
Fair Value	44,137,000	42,363,000
Municipal Notes
Investment [Line Items]
Amortized Cost	26,164,000	25,800,000
Gross Unrealized Gains	1,607,000	1,501,000
Gross Unrealized Losses	11,000	0
Fair Value	27,760,000	27,301,000
Amortized Cost		25,800,000
Gross Unrealized Gains		1,501,000
Gross Unrealized Losses		0
Fair Value		27,301,000
Debt Securities
Investment [Line Items]
Amortized Cost	115,936,000	103,552,000
Gross Unrealized Gains	2,700,000	2,606,000
Gross Unrealized Losses	131,000	106,000
Fair Value	118,505,000	106,052,000
Mutual Funds
Investment [Line Items]
Amortized Cost	6,501,000	5,369,000
Gross Unrealized Gains	47,000	52,000
Gross Unrealized Losses	24,000	33,000
Fair Value	$ 6,524,000	$ 5,388,000

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