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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Schedule Of Investments [Line Items]                
Fair value $ 6,689,479,000   $ 6,689,479,000     $ 4,647,019,000    
Gross Unrealized loss 65,591,000   65,591,000     5,517,000    
Allowance for Credit Losse, Available-for-sale securities 1,157,000   1,157,000     1,310,000    
Allowance for Credit Losse, Held-to-maturity securities 8,317,000   8,317,000     8,845,000    
Debt Securities, Held-to-maturity, Past Due $ 0   $ 0          
Debt Securities, Held-to-maturity, Threshold Period Past Due 30 days   30 days          
Accrued interest receivable on loans and investments $ 58,454,000   $ 58,454,000     69,505,000    
Municipal Bonds [Member] | Puerto Rico [Member]                
Schedule Of Investments [Line Items]                
Allowance for Credit Losse, Available-for-sale securities 8,300,000   8,300,000     8,800,000    
Allowance for Credit Losse, Held-to-maturity securities 8,317,000 $ 10,176,000 8,317,000 $ 10,176,000 $ 10,685,000 8,845,000 $ 9,268,000 $ 0
Held to Maturity Amortized cost 177,805,000   177,805,000     189,488,000    
Cash and Cash Equivalents [Member]                
Schedule Of Investments [Line Items]                
Held to Maturity Amortized cost 0   0          
MBS [Member]                
Schedule Of Investments [Line Items]                
Proceeds From Sale Of Available For Sale Securities       1,100,000        
Gain on Sale of Investments       13,400,000        
Fair value 4,329,077,000   4,329,077,000     3,455,796,000    
Gross Unrealized loss 49,045,000   49,045,000     3,951,000    
Allowance for Credit Losse, Available-for-sale securities 849,000   849,000     1,002,000    
MBS [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Fair value 7,600,000   7,600,000          
Gross Unrealized loss 3,100,000   3,100,000          
Allowance for Credit Losse, Available-for-sale securities 800,000   800,000     1,000,000.0    
Puerto Rico Government obligations [Member] | Residential Mortgage Backed Securities [Member]                
Schedule Of Investments [Line Items]                
Fair value 2,900,000   2,900,000          
Gross Unrealized loss 800,000   800,000          
Allowance for Credit Losse, Available-for-sale securities $ 300,000   $ 300,000          
Available-for-sale Securities [Member]                
Schedule Of Investments [Line Items]                
Percentage Of Debt Securities Government And Government Sponsored Agencies 99.00%   99.00%          
Allowance for Credit Losse, Available-for-sale securities $ 1,157,000 1,386,000 $ 1,157,000 1,386,000 1,166,000 1,310,000 1,631,000 0
Accrued interest receivable on loans and investments 10,900,000   10,900,000     8,500,000    
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member]                
Schedule Of Investments [Line Items]                
Allowance for Credit Losse, Available-for-sale securities 849,000 1,078,000 $ 849,000 1,078,000 858,000 1,002,000 1,323,000 0
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member]                
Schedule Of Investments [Line Items]                
Financing Receivable, Credit Quality, Additional Information     The underlying collateral is fixed-rate, single-family residential mortgage loans in the United States with original FICO scores over 700 and moderate loan-to-value ratios (under 80%), as well as moderate delinquency levels.          
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] | LIBOR [Member]                
Schedule Of Investments [Line Items]                
Loans Receivable, Description of Variable Rate Basis     The interest rate on these private-label MBS is variable, tied to 3-month LIBOR and limited to the weighted-average coupon on the underlying collateral.          
Available-for-sale Securities [Member] | Puerto Rico Government obligations [Member]                
Schedule Of Investments [Line Items]                
Allowance for Credit Losse, Available-for-sale securities 308,000 308,000 $ 308,000 308,000 $ 308,000 308,000 $ 308,000 $ 0
Held-to-maturity Securities [Member]                
Schedule Of Investments [Line Items]                
Accrued interest receivable on loans and investments 1,700,000   1,700,000     $ 3,600,000    
Held-to-maturity Securities [Member] | Municipal Bonds [Member] | Puerto Rico [Member]                
Schedule Of Investments [Line Items]                
Provision for Other Credit Losses $ (2,368,000) $ (361,000) $ (528,000) $ 773,000