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Fair Value Disclosures - Additional Information (Detail) (USD $)				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]
Impaired loans carrying value	$ 22,509,000
Impaired loans valuation reserves	5,793,000
Impaired loans net fair value	16,716,000
Debt discounts, percentage				5.00%	25.00%
Other real estate owned, total	$ 3,052,000	$ 3,505,000	$ 7,815,000

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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