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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Accounting for financial instruments credit losses (Detail) - USD ($)
1 Months Ended 3 Months Ended
Feb. 27, 2015
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Loans and Leases Receivable, Gross   $ 9,000,000.0    
Business Acquisition Branches Acquired 10      
Debt Securities, Held-to-maturity, Past Due   0    
Accrued interest receivable   49,425,000   $ 50,205,000
Allowance for Credit Losse, Held-to-maturity securities   9,268,000   0
Debt Securities, Available-for-sale, Allowance for Credit Loss   $ 368,000   0
Debt Securities, Held-to-maturity, Threshold Period Past Due   30 days    
Municipal Bonds [Member] | Puerto Rico [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Held To Maturity Securities   $ 138,534,000   138,675,000
Allowance for Credit Losse, Held-to-maturity securities   9,268,000   0
ASC 326        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Debt Securities, Held-to-maturity, Past Due   0    
Accrued interest reverse   500,000    
Allowance for Credit Losse, Held-to-maturity securities     $ 8,134,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss   $ 300,000    
Threshold Period Past Due Of Financing Receivables To Be Considered Nonperforming   90 days    
Troubled Debt Restructurings Sustained Performance Period   6 months    
ASC 326 | Nonaccrual [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Debt Securities, Held-to-maturity, Threshold Period Past Due   90 days    
ASC 326 | Residential Portfolio Segment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due, Writeoff   180 days    
Threshold Period Past Due Of Financing Receivables To Be Considered Delinquent   2 months    
ASC 326 | Residential Portfolio Segment [Member] | Adjustable Rate Residential Mortgage [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Loans Receivable With Hybrid Ajustable Rate   57.00%    
ASC 326 | Residential Portfolio Segment [Member] | Puerto Rico Housing Finance Authority [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Period Of Guaranteed Residential Mortgage Loans That Are No Longer Accruing Interest   90 days    
ASC 326 | Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Past due 90 days and still accruing   90 days    
Period Of Guaranteed Residential Mortgage Loans That Are No Longer Accruing Interest   15 months    
ASC 326 | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due Of Financing Receivables To Be Considered Delinquent   30 days    
ASC 326 | Commercial Portfolio Segment [Member] | Construction Loans [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due Of Financing Receivables To Be Considered Delinquent   2 months    
ASC 326 | Consumer Portfolio Segment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due Of Financing Receivables To Be Considered Delinquent   30 days    
ASC 326 | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due, Writeoff   180 days    
ASC 326 | Consumer Portfolio Segment [Member] | Automobile Loan [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due, Writeoff   120 days    
ASC 326 | Consumer Portfolio Segment [Member] | Finance Leases [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due, Writeoff   120 days    
ASC 326 | Consumer Portfolio Segment [Member] | Boat loans [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due, Writeoff   120 days    
ASC 326 | Consumer Portfolio Segment [Member] | Small Loans [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due, Writeoff   180 days    
ASC 326 | Consumer Portfolio Segment [Member] | Personal Loans [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due, Writeoff   180 days    
ASC 326 | Loans and Finance Receivables [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accrued interest receivable   $ 40,000,000.0   39,100,000
ASC 326 | Mortgage Receivable [Member] | Commercial Portfolio Segment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Threshold Period Past Due Of Financing Receivables To Be Considered Delinquent   2 months    
ASC 326 | Minimum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Loans individually evaluated   $ 500,000    
ASC 326 | PCD loans [Member] | Residential Portfolio Segment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Loans and Leases Receivable, Gross   131,500,000    
ASC 326 | PCD loans [Member] | Mortgage Receivable [Member] | Commercial Portfolio Segment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Loans and Leases Receivable, Gross   2,500,000    
ASC 326 | Held-to-maturity Securities [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accrued interest receivable   1,900,000   3,900,000
ASC 326 | Available-for-sale Securities [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accrued interest receivable   $ 5,600,000   $ 5,500,000
ASC 326 | Puerto Rico and Virgin Islands regions [Member] | Minimum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reversion period   2    
ASC 326 | Puerto Rico and Virgin Islands regions [Member] | Maximum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reversion period   3    
ASC 326 | Florida region        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reversion period   5    
ASC 326 | Municipal Bonds [Member] | Puerto Rico [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Held To Maturity Securities   $ 138,500,000    
Percentage Of Held To Maturity Securities   70.00%    
Allowance for Credit Losse, Held-to-maturity securities   $ 9,300,000    
ASC 326 | Municipal Bonds [Member] | Puerto Rico [Member] | Minimum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reversion period   2    
ASC 326 | Municipal Bonds [Member] | Puerto Rico [Member] | Maximum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reversion period   3