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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Securities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Investments [Line Items]    
Interest Receivable $ 69,505 $ 50,205
Debt Securities, Held-to-maturity, Allowance for Credit Loss 8,845 0
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 1,310 0
Debt Securities, Held-to-maturity, Threshold Period Past Due 30 years  
Held-to-maturity Securities [Member]    
Schedule Of Investments [Line Items]    
Interest Receivable $ 3,600 3,900
Available-for-sale Securities [Member]    
Schedule Of Investments [Line Items]    
Interest Receivable 8,500 5,500
Municipal Bonds [Member] | PUERTO RICO    
Schedule Of Investments [Line Items]    
Debt Securities, Held-to-maturity $ 189,488 138,675
Percentage Of Held To Maturity Securities 60.00%  
Debt Securities, Held-to-maturity, Allowance for Credit Loss $ 8,845 $ 0
Municipal Bonds [Member] | PUERTO RICO | Held-to-maturity Securities [Member]    
Schedule Of Investments [Line Items]    
ACL forecast period P2Y  
ACL Reversion Period P3Y