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Note FDIC loss-share asset and true-up payment obligation (FDIC loss share - Additional Information) (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 22, 2018
Mar. 31, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition, Contingent Consideration              
OREO transfer to non-covered status   $ 15,300   $ 0 [1]      
Loans transfer to non-covered status   514,600          
Payment to the FDIC as a consideration for the termination of the loss share agreement. $ 23,700            
Carrying amount (fair value)   171,000     $ 165,000    
FDIC loss-share asset net   45,600   0 45,192 $ 41,756 $ 310,221
Balance Due To F D I C   $ 1,100   0 (1,124) (27,578)  
Gain from the FDIC termination agreement       102,752 [2] $ 0 $ 0  
Non-covered loans | Mortgages              
Business Acquisition, Contingent Consideration              
OREO transfer to non-covered status [1]       $ 15,333      
Banco Popular de Puerto Rico              
Business Acquisition, Contingent Consideration              
Loss Sharing Agreement Allocation Percentage     80.00%        
[1]
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.
[2]
Refer to Note 10 for additional information of the Termination Agreement with the FDIC.