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Investment Securities - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Investment [Line Items]
Number of investment positions in continuous loss position	23
Available-for-sale Securities, amortized cost	$ 122,437,000	$ 108,921,000
Available-for-sale Securities, fair value	125,029,000	111,440,000
Government and Agencies Debt Securities
Investment [Line Items]
Number of investment positions in continuous loss position	21
Percentage amount by which investment positions in continuous loss position had depreciated from amortized cost basis	0.50%
Collateralized Mortgage Obligations Issued By Private Enterprise
Investment [Line Items]
Percentage amount by which investment positions in continuous loss position had depreciated from amortized cost basis	20.10%
Available-for-sale Securities, amortized cost	720,000	896,000
Available-for-sale Securities, fair value	684,000	880,000
Collateralized Mortgage Obligations Issued By Private Enterprise | Securities Downgraded To Substandard
Investment [Line Items]
Available-for-sale Securities, amortized cost	243,000
Available-for-sale Securities, fair value	$ 194,000

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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