Loans Receivable and Allowance for Loan Losses - Schedule of FDIC Loss Sharing Receivable (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
FDIC Indemnification Asset [Roll Forward]
Ending balance as of June 30,	$ (1,381)	$ (1,455)	$ (2,083)	$ 2,320
Effect attributable to FDIC loss share arrangements	0	(105)	289	(3,845)
Increased estimated cash flows from covered OREO	0	3,138	0	3,138
Other activity, net	0	61	(255)	529
Cash payments to (receipts from) the FDIC	1,381	(1,437)	2,049	(1,940)
Ending balance as of September 30,	0	202	0	202
Provision for loan losses	88	1,989	3,143	10,548
Effect attributable to FDIC loss share arrangements	0	105	(289)	3,845
Provision for loan losses	$ 88	$ 2,094	$ 2,854	$ 14,393