Note FDIC loss share asset (Activity in the FDIC loss share indemnification asset) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Disclosure Activity In The F D I C Loss Share Indemnification Asset [Abstract]
Beginning balance	$ 310,221	$ 542,454
(Amortization) accretion of indemnification asset	(4,042)	(27,316)
Credit impairment losses to be covered under loss sharing agreements	(2,093)	8,246
Reimbursable Expenses	3,950	21,545
FDIC Indemnification Asset Net Cash Payments Received	(88,588)	(132,265)
Other adjustments attributable to FDIC loss sharing agreements	0	(2,820)
Ending balance	$ 219,448	$ 409,844