Loans Receivable, Net - Summary of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Receivables [Abstract]
Impaired loans with no allocated allowance for loan losses	$ 25,312	$ 25,513
Impaired loans with allocated allowance for loan losses	11,787	12,033
Total	37,099	37,546
Amount of the allowance for loan losses allocated	$ 3,436	$ 2,554