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Loans Modified As Troubled Debt Restructurings Excluding on Nonaccrual Status (Detail) (Extended Payment Terms, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Contract
Financing Receivable, Modifications [Line Items]
Total Contracts	1
Pre-Modification Recorded Investment	$ 351
Post-Modification Recorded Investment	319
Single Family Owner Occupied
Financing Receivable, Modifications [Line Items]
Total Contracts	1
Pre-Modification Recorded Investment	351
Post-Modification Recorded Investment	$ 319

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