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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 37,491	$ 28,186	$ 30,932	$ 23,998
Provision for loan losses	1,989	3,222	10,548	8,853
Charge-offs	(5,932)	(792)	(8,880)	(2,733)
Recoveries	275	467	1,223	965
Ending balance	$ 33,823	$ 31,083	$ 33,823	$ 31,083