Loans Receivable and Allowance for Loan Losses - Schedule of Changes in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance as of June 30,	$ 38,097	$ 37,491	$ 35,647	$ 30,932
Provision for loan losses	88	1,989	3,143	10,548
Charge-offs	(666)	(5,932)	(1,848)	(8,880)
Recoveries	378	275	955	1,223
Ending balance as of September 30,	$ 37,897	$ 33,823	$ 37,897	$ 33,823