Note Other Real Estate Owned (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	$ 212,573	$ 191,916
Other Real Estate Owned Write Downs	(4,786)	(4,233)
Additions	34,901	30,569
Other Real Estate Owned Sales	(26,799)	(13,744)
Other adjustments	(127)	(2,151)
Other Real Estate Owned Ending Balance	215,762	202,357
Non-covered loans | Mortgages
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	160,044	122,760
Other Real Estate Owned Write Downs	(2,755)	(2,016)
Additions	26,254	24,276
Other Real Estate Owned Sales	(20,409)	(8,500)
Other adjustments	148	(914)
Other Real Estate Owned Ending Balance	163,282	135,606
Non-covered loans | Commercial / Construction
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	20,401	32,471
Other Real Estate Owned Write Downs	(1,259)	(1,717)
Additions	4,538	1,810
Other Real Estate Owned Sales	(993)	(1,595)
Other adjustments	(133)	(615)
Other Real Estate Owned Ending Balance	22,554	30,354
Covered loans | Mortgages
Other Real Estate Owned Rollforward [Line Items]
Other Real Estate Owned Beginning Balance	32,128	36,685
Other Real Estate Owned Write Downs	(772)	(500)
Additions	4,109	4,483
Other Real Estate Owned Sales	(5,397)	(3,649)
Other adjustments	(142)	(622)
Other Real Estate Owned Ending Balance	$ 29,926	$ 36,397