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Cash and Cash Equivalents - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Cash and Cash Equivalents [Line Items]
Maintenance period of reserve on liabilities	30 days
Federal reserve required the Bank to maintain reserves	$ 12,900,000
Maintenance period of reserve on liabilities	1,800,000
Restricted cash and cash equivalents pledged	$ 704,000	$ 703,000

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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