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INVESTMENT SECURITIES - ACL for Debt Securities Held-to-Maturity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Jan. 01, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Beginning Balance $ 0  
Ending Balance 9,268  
Municipal Bonds [Member] | PUERTO RICO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Beginning Balance 0  
Ending Balance 9,268  
Municipal Bonds [Member] | PUERTO RICO | ASC 326    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Ending Balance 9,300  
Municipal Bonds [Member] | PUERTO RICO | ASC 326 | Cumulative Effect Period Of Adoption Adjustment [Member]    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Impact of adopting ASC 326 on Held-to-maturity securities   $ 8,134
Municipal Bonds [Member] | PUERTO RICO | Held-to-maturity Securities [Member]    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Provision for Other Credit Losses $ 1,134