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Note Other Real Estate Owned (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Real Estate Owned Rollforward        
Balance at beginning of the period $ 188,855 $ 188,855 $ 212,573 $ 191,916
Write-downs in value   (13,641) (25,198) [1] (15,071)
Additions   51,855 89,593 130,100
Sales   (89,720) (87,183) (90,926)
Other adjustments   (644) (930) (3,446)
Transfer to non-covered status 15,300 0 [2]    
Ending balance   136,705 188,855 212,573
Non-covered loans | Mortgages        
Other Real Estate Owned Rollforward        
Balance at beginning of the period 147,849 147,849 160,044 122,760
Write-downs in value   (10,380) (16,876) [1] (9,889)
Additions   41,167 70,763 105,140
Sales   (78,330) (68,145) (56,826)
Other adjustments   (728) 2,063 (1,141)
Transfer to non-covered status [2]   15,333    
Ending balance   114,911 147,849 160,044
Non-covered loans | Commercial / Construction        
Other Real Estate Owned Rollforward        
Balance at beginning of the period 21,411 21,411 20,401 32,471
Write-downs in value   (2,974) (5,011) [1] (2,909)
Additions   10,688 8,918 7,372
Sales   (8,108) (2,765) (15,894)
Other adjustments   777 (132) (639)
Transfer to non-covered status [2]   0    
Ending balance   21,794 21,411 20,401
Covered loans | Mortgages        
Other Real Estate Owned Rollforward        
Balance at beginning of the period $ 19,595 19,595 32,128 36,685
Write-downs in value   (287) (3,311) [1] (2,273)
Additions   0 9,912 17,588
Sales   (3,282) (16,273) (18,206)
Other adjustments   (693) (2,861) (1,666)
Transfer to non-covered status [2]   (15,333)    
Ending balance   $ 0 $ 19,595 $ 32,128
[1]
Includes $2.7 million related to the damages from Hurricane Maria, of which $1.3 million were for commercial and $1.4 million for residential.
[2]
Represents the reclassification of OREOs to the non-covered category, pursuant to the Termination Agreement of all shared-loss agreements with the Federal Deposit Insurance Corporation related to loans acquired from Westernbank, that was completed on May 22, 2018.