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LOAN PORTFOLIO - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended 21 Months Ended
Mar. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
numberofcontracts
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2011
USD ($)
Dec. 30, 2017
USD ($)
Dec. 31, 2014
USD ($)
Accounts Notes And Loans Receivable [Line Items]                      
Interest Income on Impaired Loans Accrual Basis           $ 24,243 $ 24,095        
Contractually outstanding principal and interest at acquisition       $ 207,300   196,600 207,300        
Loans       8,886,873   8,850,476 8,886,873        
Total TDR loans       647,048   587,219 647,048 $ 661,591     $ 694,453
Financing Receivable, Modifications, Recorded Investment       647,048   587,219 647,048 661,591     $ 694,453
Provsion of PCI Loans           4,394 2,895        
Classified And Non Performing Loans Sold       16,300 $ 147,500            
Other Real Estate Owned Sold         2,900            
Sales Price Of Bulk Sale         87,300            
Reserves Allocated To Bulk Sale       2,800 15,300   2,800        
Bulk Sale Charge Offs       4,600 61,400            
Professional Fees Bulk Sale         900            
PreTax Loss Bulk Sale       1,800 48,700            
Recoveries           16,756 15,088        
Line Of Credit Facility Provided To Fund Unfunded Commitments                 $ 80,000    
Loans Receivable Held For Sale Net       50,006   32,980 50,006        
Proceeds From Sale Of Loans Held For Investment           $ 53,245 31,852 107,702      
Trouble Debt Restructurings Trial Period           5 months 27 days          
Threshold Mortgage Loans Principal Amount Puerto Rico Housing Financing Authority         75,000            
Puerto Rico Housing Finance Authority Covered Loans         552,000            
Puerto Rico Housing Finance Authority Restricted Net Position         77,400            
Residential mortgage loans in process of foreclosure           $ 162,200          
Mortgage Loans Foreclosure Delinquency Threshold           4 months          
Classified And Non Performing Loans Sold Outstanding Balance       20,100              
Financing Receivable Allowance For Credit Losses Write Offs Impaired Loans [1]           $ 82,113 67,210 99,023      
Proceeds From Sale Of Non Performing Assets Sold       11,300              
Proceeds From Principal Repayments On Loans And Leases Held For Investment           2,504,629 2,830,830 2,969,616      
Hurricane [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Provsion of PCI Loans           $ 1,800          
Hurricane [Member] | Payment Deferral [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Payment Deferral Period           2 months 29 days          
Residential Mortgage Loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Financing Receivable Significant Purchases           $ 58,900          
Securitization of mortgage loans into mortgage backed securities           235,100          
Loans       3,296,031   3,290,957 3,296,031        
Recoveries           2,437 2,941        
Residential Mortgage Loans [Member] | Hurricane [Member] | Payment Deferral [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Loans           $ 1,300,000          
Financing Receivable Deferral Payment Number Of Agreements | numberofcontracts           9,588          
Residential Mortgage Loans [Member] | Hurricane [Member] | Financing Receivables 30 To 89 Days Past Due [Member] | Payment Deferral [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Loans           $ 95,100          
Government Guaranteed Loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Total TDR loans       69,100   62,100 69,100        
Financing Receivable, Modifications, Recorded Investment       69,100   62,100 69,100        
Residential mortgage loans in process of foreclosure           23,600          
Loans in trial [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Total TDR loans           800          
Financing Receivable, Modifications, Recorded Investment           800          
Troubled Debt Restructurings [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Outstanding unfunded commitments on TDR loans           9,400          
Allowance For Loan And Lease Losses Write Offs Loans Sold           10,700 1,300 45,300      
Loans Split [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Total TDR loans       36,971   35,577 36,971 39,329      
Financing Receivable, Modifications, Recorded Investment       36,971   35,577 36,971 39,329      
Financing Receivable Loans Restructured Recorded Investment Accruals           3,100          
Non-FHA/VA Residential Mortgage loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Total TDR loans       375,809   363,930 375,809 382,672      
Financing Receivable, Modifications, Recorded Investment       375,809   363,930 375,809 382,672      
Commercial And Industrial Loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Interest Income on Impaired Loans Accrual Basis           1,447 631        
Total TDR loans       133,521   94,112 133,521 150,254      
Financing Receivable, Modifications, Recorded Investment       133,521   94,112 133,521 150,254      
Classified And Non Performing Loans Sold         45,800            
Payments To Acquire Loans Held For Investment           52,600          
Commercial Mortgage Loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Interest Income on Impaired Loans Accrual Basis           1,983 1,403        
Loans       1,568,808   1,614,972 1,568,808        
Total TDR loans       48,742   50,812 48,742 44,498      
Financing Receivable, Modifications, Recorded Investment       48,742   50,812 48,742 44,498      
Classified And Non Performing Loans Sold         90,700            
Recoveries           270 816        
Proceeds From Sale Of Loans Held For Investment             20,200 20,000      
Construction Loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Loans       124,951   111,397 124,951        
Total TDR loans           41,800          
Financing Receivable, Modifications, Recorded Investment           41,800          
Classified And Non Performing Loans Sold         $ 11,000            
Recoveries           732 316        
Consumer Loan [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Loans       1,716,628   1,749,897 1,716,628        
Total TDR loans           36,600          
Financing Receivable, Modifications, Recorded Investment           36,600          
Recoveries           7,562 8,326        
Impaired Loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance For Loan And Lease Losses Write Offs Loans Sold           10,700 4,200 63,900      
Commercial Portfolio Segment [Member] | Hurricane [Member] | Payment Deferral [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Loans           $ 1,200,000          
Financing Receivable Deferral Payment Number Of Agreements | numberofcontracts           351          
Commercial Portfolio Segment [Member] | Hurricane [Member] | Financing Receivables 30 To 89 Days Past Due [Member] | Payment Deferral [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Loans           $ 3,200          
Fnma And Fhlmc [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Loans Repurchased           36 700 1,400      
Fnma And Fhlmc [Member] | Residential Mortgage Loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Financing Receivable Significant Sales           87,500          
Puerto Rico Tourism Development Fund [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Outstanding of credit facilities granted       127,700   120,200 127,700        
Financing Receivable Commercial Governments Book Value       111,800   $ 70,800 111,800        
Unpaid Principal Balance Percentage           52.00%          
Proceeds From Interest Received                   $ 4,700  
Financing Receivable Allowance For Credit Losses Write Offs Impaired Loans           $ 30,800          
Proceeds From Principal Repayments On Loans And Leases Held For Investment $ 4,000 $ 7,600                  
Puerto Rico Electric Power Authority [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Classified And Non Performing Loans Sold     $ 64,000                
Reserves Allocated To Bulk Sale     10,200                
PreTax Loss Bulk Sale     600                
Classified And Non Performing Loans Sold Outstanding Balance     75,000                
Proceeds From Sale Of Non Performing Assets Sold     $ 53,200                
Puerto Rico Housing Finance Authority [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Government Guaranteed Residential Mortgage Loans           116,500          
GNMA certificates [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Loans Repurchased           $ 25,100 29,100 $ 19,200      
Puerto Rico [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Credit risk concentration           75.00%          
Outstanding of credit facilities granted       133,600   $ 55,900 133,600        
Puerto Rico [Member] | Puerto Rico Government And Political Subdivisions [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Outstanding of credit facilities granted           33,900          
Puerto Rico [Member] | Public Corporations [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Outstanding of credit facilities granted           15,100          
Puerto Rico [Member] | Government [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Outstanding of credit facilities granted           $ 6,800          
Virgin Islands [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Credit risk concentration           6.00%          
Outstanding of credit facilities granted       $ 84,700   $ 70,400 $ 84,700        
Virgin Islands [Member] | Public Corporations [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Outstanding of credit facilities granted           47,200          
Virgin Islands [Member] | Government [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Outstanding of credit facilities granted           $ 23,200          
United States [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Credit risk concentration           19.00%          
Credit Impaired Loans [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Residential mortgage loans in process of foreclosure           $ 20,500          
[1]
For the year ended December 31, 2017, includes a charge-off of $10.7 million related to the sale of the PREPA credit line, as further discussed below. For the year ended December 31, 2016, includes $4.2 million of charge-offs related to impaired loans included in a sale of a $16.3 million pool of non-performing assets and, for the year ended December 31, 2015, includes $63.9 million of charge-offs related to a bulk sales of assets, as further discussed below.