Note FDIC loss share asset (Activity in the FDIC loss share indemnification asset) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Disclosure Activity In The F D I C Loss Share Indemnification Asset [Abstract]
Beginning balance	$ 219,448	$ 409,844	$ 310,221	$ 542,454
(Amortization) accretion of indemnification asset	(4,036)	(31,065)	(8,078)	(58,381)
Credit impairment losses to be covered under loss sharing agreements	475	7,647	(1,618)	15,893
Reimbursable Expenses	2,235	42,730	6,185	64,275
Recoveries On Covered Assets	(4,093)	0	(4,093)	0
FDIC Indemnification Asset Net Cash Payments Received	0	(32,158)	(88,588)	(164,423)
Other adjustments attributable to FDIC loss sharing agreements	0	(4,051)	0	(6,871)
Ending balance	$ 214,029	$ 392,947	$ 214,029	$ 392,947