Loans Receivable and Allowance for Loan Losses - Schedule of Changes in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance as of March 31,	$ 37,605	$ 33,566	$ 35,647	$ 30,932
Provision for loan losses	1,552	4,924	3,055	8,559
Charge-offs	(1,140)	(1,804)	(1,182)	(2,948)
Recoveries	80	805	577	948
Ending balance as of June 30,	$ 38,097	$ 37,491	$ 38,097	$ 37,491