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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Accounting for financial instruments credit losses (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Gross $ 11,800,000,000 $ 11,800,000,000      
Debt Securities, Held-to-maturity, Threshold Period Past Due 30 days 30 days      
Accrued interest receivable $ 77,240,000 $ 77,240,000     $ 50,205,000
Allowance for credit losses, Held-to-Maturity securities 10,176,000 10,176,000     0
Debt Securities, Available-for-sale, Allowance for Credit Loss 1,386,000 1,386,000 $ 1,631,000   0
Interest income reversed of nonacrrual loans 412,000 1,497,000      
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 0 0      
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 43,000 119,000      
Commercial Portfolio Segment [Member] | Construction Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 19,000 61,000      
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 0 0      
Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 17,000 138,000      
Consumer Portfolio Segment [Member] | Finance Leases [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 2,000 23,000      
Consumer Portfolio Segment [Member] | Personal Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 8,000 36,000      
Consumer Portfolio Segment [Member] | Other Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 0 9,000      
Mortgage Receivable [Member] | Commercial Portfolio Segment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 35,000 142,000      
PR And VI [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 374,000 1,307,000      
PR And VI [Member] | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 0 0      
PR And VI [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 24,000 67,000      
PR And VI [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 19,000 61,000      
PR And VI [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 0 0      
PR And VI [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 17,000 138,000      
PR And VI [Member] | Consumer Portfolio Segment [Member] | Finance Leases [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 2,000 23,000      
PR And VI [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 8,000 36,000      
PR And VI [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 0 5,000      
PR And VI [Member] | Mortgage Receivable [Member] | Commercial Portfolio Segment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans 35,000 142,000      
Municipal Bonds [Member] | PUERTO RICO          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Held To Maturity Securities 189,156,000 189,156,000     138,675,000
Allowance for credit losses, Held-to-Maturity securities 10,176,000 10,176,000 $ 9,268,000   0
Accounting Standards Update 2016-13 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Debt Securities, Held-to-maturity, Nonaccrual $ 0 $ 0      
Debt Securities, Held-to-maturity, Threshold Period Past Due 90 days 90 days      
Allowance for credit losses, Held-to-Maturity securities       $ 8,134,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 1,400,000 $ 1,400,000      
Threshold Period Past Due Of Financing Receivables To Be Considered Nonperforming 90 days        
Troubled debt restructurings sustained performance period 6 months 6 months      
Threshold Period Past Due Of Financing Receivables To Be Considered Delinquent 30 days        
Accounting Standards Update 2016-13 [Member] | Nonperforming Financing Receivable [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Interest income reversed of nonacrrual loans $ (300,000) $ 800,000      
Accounting Standards Update 2016-13 [Member] | Home Equity Line of Credit [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable Threshold Period Collateral Dependent 180 days        
Accounting Standards Update 2016-13 [Member] | Residential Portfolio Segment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Threshold Period Past Due, Writeoff 180 days 180 days      
Monthly payments in arrears for a loan to be considered delinquent   2 months      
Financing Receivable Threshold Period Collateral Dependent 180 days        
Accounting Standards Update 2016-13 [Member] | 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        
Accounting Standards Update 2016-13 [Member] | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Period Of Guaranteed Residential Mortgage Loans That Are No Longer Accruing Interest 15 months        
Accounting Standards Update 2016-13 [Member] | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Puerto Rico Housing Finance Authority [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Guaranteed Loans Past Due 90 days        
Accounting Standards Update 2016-13 [Member] | 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        
Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Monthly payments in arrears for a loan to be considered delinquent   2 months      
Accounting Standards Update 2016-13 [Member] | 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        
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Threshold Period Past Due, Writeoff 180 days 180 days      
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Threshold Period Past Due, Writeoff 120 days 120 days      
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member] | Finance Leases [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Threshold Period Past Due, Writeoff 120 days 120 days      
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member] | Small Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Threshold Period Past Due, Writeoff 180 days 180 days      
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member] | Personal Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Threshold Period Past Due, Writeoff 120 days 120 days      
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Threshold Period Past Due, Writeoff 120 days 120 days      
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Threshold Period Past Due, Writeoff 180 days 180 days      
Accounting Standards Update 2016-13 [Member] | Loans and Finance Receivables [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accrued interest receivable $ 67,200,000 $ 67,200,000     39,100,000
Accounting Standards Update 2016-13 [Member] | Mortgage Receivable [Member] | Commercial Portfolio Segment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Monthly payments in arrears for a loan to be considered delinquent   2 months      
Accounting Standards Update 2016-13 [Member] | Minimum [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Individually Evaluated for Impairment 500,000 $ 500,000      
Accounting Standards Update 2016-13 [Member] | Held-to-maturity Securities [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accrued interest receivable 1,800,000 1,800,000     3,900,000
Accounting Standards Update 2016-13 [Member] | Available for sale Securities [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accrued interest receivable 7,900,000 $ 7,900,000     $ 5,500,000
Accounting Standards Update 2016-13 [Member] | PR And VI [Member] | Loans and Finance Receivables [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Forecast period   P2Y      
Reversion Period   P3Y      
Accounting Standards Update 2016-13 [Member] | FL | 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%      
Accounting Standards Update 2016-13 [Member] | FL | Loans and Finance Receivables [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Forecast period   P5Y      
Reversion Period   P5Y      
Accounting Standards Update 2016-13 [Member] | Municipal Bonds [Member] | PUERTO RICO          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Held To Maturity Securities $ 189,200,000 $ 189,200,000      
Percentage Of Held To Maturity Securities 60.00% 60.00%      
Allowance for credit losses, Held-to-Maturity securities $ 10,200,000 $ 10,200,000      
Accounting Standards Update 2016-13 [Member] | Municipal Bonds [Member] | PUERTO RICO | Held-to-maturity Securities [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Forecast period   P2Y      
Accounting Standards Update 2016-13 [Member] | Municipal Bonds [Member] | PUERTO RICO | Held-to-maturity Securities [Member] | Maximum [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reversion Period   P3Y