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Credit Quality Assessment - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Troubled Debt Restructurings Balance	$ 1,399,000	$ 4,918,000
Financing Receivable Troubled Debt Restructurings Specific Allowance	32,000	1,223,000
Additional Financing Receivable Troubled Debt Restructurings Restructured	5,600,000	2,600,000
Foreclosed Assets	$ 5,250,000	$ 5,926,000

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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