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Loans Modified As Troubled Debt Restructurings Under Payment Default (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Contract
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Recorded Investment	$ 38
Post-Modification Recorded Investment	38
Non-farm, Non-residential
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Recorded Investment	38
Post-Modification Recorded Investment	$ 38

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