Indemnification Asset/Liability - Summary of Activity in Balance of Indemnification Asset (Liability) (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]
Beginning (payable) receivable balance	$ (607)	$ (433)	$ (521)	$ (349)
Effect of actual covered losses and change in estimated future covered losses	(151)	(24)	(262)	(86)
Reimbursable expenses (revenue), net		(18)	(4)	(21)
Payments made (received)	96	9	125	(10)
Ending payable balance	(662)	(466)	(662)	(466)
Amount of indemnification asset (liability) recorded in other assets			(29)	105
Amount of indemnification liability recorded in other liabilities			(633)	(571)
Ending balance	$ (607)	$ (433)	$ (662)	$ (466)