Note FDIC loss share (expense) income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
F D I C Loss Share Expense Income [Line Items]
(Amortization) accretion of indemnification asset	$ (4,036)	$ (31,065)	$ (8,078)	$ (58,381)
80% mirror accounting on credit impairment losses	475	7,647	(1,618)	15,893
80% mirror accounting on reimbursable expenses	2,235	42,730	6,185	64,275
80% mirror accounting on recoveries on covered assets, including rental income on OREOs, subject to reimbursement to the FDIC	(3,956)	(5,203)	(4,601)	(7,822)
Change in true-up payment obligation	(7,688)	3,672	(8,131)	7,836
Other	394	1,294	521	1,413
Continuing Operations
F D I C Loss Share Expense Income [Line Items]
FDIC loss share (expense) income	$ (12,576)	$ 19,075	$ (15,722)	$ 23,214