Loans Receivable, Net (Summary of Impaired Loans) (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired loans with no allocated allowance for loan losses	$ 22,378,000	$ 19,186,000
Impaired loans with allocated allowance for loan losses	13,186,000	9,305,000
Total	35,564,000	28,491,000
Amount of the allowance for loan losses allocated	$ 2,494,000	$ 2,165,000