Loans Receivable, Net - Summary of Impaired Loans Excluding PCI Loans (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Impaired loans with no allocated allowance for loan losses	$ 34,015,000	$ 26,487,000
Impaired loans with allocated allowance for loan losses	11,558,000	10,492,000
Total	45,573,000	36,979,000
Amount of the allowance for loan losses allocated	$ 2,400,000	$ 2,161,000