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ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Financing Receivable Allowance For Credit Losses [Line Items]          
Reserve for unfunded loan commitments $ 700 $ 700 $ 1,600    
Provision For Loan And Lease Losses   144,254 86,733 $ 172,045  
Loans and leases receivable gross carrying value 8,850,476 8,850,476 8,886,873    
Financing Receivable Allowance For Credit Losses Write Offs   134,770 136,928    
Financing Receivable Allowance For Credit Losses 231,843 $ 231,843 205,603 240,710  
P R          
Financing Receivable Allowance For Credit Losses [Line Items]          
Concentration Risk Percentage 1   75.00%      
V I          
Financing Receivable Allowance For Credit Losses [Line Items]          
Concentration Risk Percentage 1   6.00%      
U S          
Financing Receivable Allowance For Credit Losses [Line Items]          
Concentration Risk Percentage 1   19.00%      
Puerto Rico And Virgin Islands [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Loans and leases receivable gross carrying value 7,200 $ 7,200      
Concentration Risk Percentage 1   81.00%      
Hurricane [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Provision For Loan And Lease Losses 4,800 $ 71,300      
Commercial Loans Storm Related Individual Assesment Percentage   80.00%      
Financing Receivable Allowance For Credit Losses 68,500 $ 68,500     $ 66,500
Hurricane [Member] | P R          
Financing Receivable Allowance For Credit Losses [Line Items]          
Financing Receivable Allowance For Credit Losses 62,900 62,900      
Hurricane [Member] | V I          
Financing Receivable Allowance For Credit Losses [Line Items]          
Financing Receivable Allowance For Credit Losses 5,600 5,600      
Residential Mortgage [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Loans and leases receivable gross carrying value 3,290,957 3,290,957 3,296,031    
Financing Receivable Allowance For Credit Losses Write Offs   28,186 33,621    
Financing Receivable Allowance For Credit Losses 58,975 58,975 33,980 39,570  
Residential Mortgage [Member] | Hurricane [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Financing Receivable Allowance For Credit Losses 14,600 14,600      
Commercial Mortgage [Member] | Hurricane [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Financing Receivable Allowance For Credit Losses 12,100 12,100      
Commercial And Industrial [Member] | Hurricane [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Financing Receivable Allowance For Credit Losses 15,900 15,900      
Construction Loans [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Loans and leases receivable gross carrying value 111,397 111,397 124,951    
Financing Receivable Allowance For Credit Losses Write Offs   3,607 1,770    
Financing Receivable Allowance For Credit Losses 4,522 4,522 2,562 3,519  
Construction Loans [Member] | Hurricane [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Financing Receivable Allowance For Credit Losses Write Offs   2,800      
Financing Receivable Allowance For Credit Losses 900 900      
Consumer Loan [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Loans and leases receivable gross carrying value 1,749,897 1,749,897 1,716,628    
Financing Receivable Allowance For Credit Losses Write Offs   44,030 54,504    
Financing Receivable Allowance For Credit Losses 70,982 70,982 $ 49,847 $ 60,642  
Consumer Loan [Member] | Hurricane [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Financing Receivable Allowance For Credit Losses $ 25,000 $ 25,000      
Commercial Portfolio Segment [Member] | Puerto Rico And Virgin Islands [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Concentration Risk Percentage 1   40.00%      
Residential And Consumer Loans [Member] | Puerto Rico And Virgin Islands [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Concentration Risk Percentage 1   60.00%