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Other Borrowings - Assets Pledged As Collateral With FRB (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Assets pledged as collateral with the FRB	$ 21,501	$ 27,566
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Assets pledged as collateral with the FRB	5,122	6,559
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Assets pledged as collateral with the FRB	$ 16,379	$ 21,007

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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