Loans Receivable and Allowance for Loan Losses - Schedule of FDIC Loss Sharing Receivable (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
FDIC Indemnification Asset [Roll Forward]
Ending balance as of March 31,	$ (2,544)	$ 3,427	$ (2,083)	$ 2,320
Increased (decreased) estimated cash flows	766	(4,411)	289	(3,740)
Other activity, net	49	334	(255)	468
Cash payments to (receipts from) the FDIC	348	(805)	668	(503)
Ending balance as of June 30,	(1,381)	(1,455)	(1,381)	(1,455)
Provision for loan losses	1,552	4,924	3,055	8,559
Effect attributable to FDIC loss share arrangements	(766)	4,411	(289)	3,740
Provision for loan losses	$ 786	$ 9,335	$ 2,766	$ 12,299