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DEBT SECURITIES - Investments Securities Held to Maturity (Securities in continuous unrealized loss position) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule Of Held To Maturity Securities [Line Items]    
HTM Fair Value Less than 12 months $ 156,770 $ 260,106
HTM Unrealized Losses Less than 12 months 8,453 11,721
HTM Fair Value 12 months or more 195,424 98,797
HTM Unrealized Losses 12 months or more 9,486 2,769
HTM Fair Value 352,194 358,903
HTM Unrealized Losses 17,939 14,490
Commercial MBS [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
HTM Fair Value Less than 12 months 9,054 100,523
HTM Unrealized Losses Less than 12 months 479 4,565
HTM Fair Value 12 months or more 87,751 0
HTM Unrealized Losses 12 months or more 5,628 0
HTM Fair Value 96,805 100,523
HTM Unrealized Losses 6,107 4,565
FHLMC [Member] | Residential MBS [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
HTM Fair Value Less than 12 months 35,663 39,171
HTM Unrealized Losses Less than 12 months 2,109 1,634
HTM Fair Value 12 months or more 0 0
HTM Unrealized Losses 12 months or more 0 0
HTM Fair Value 35,663 39,171
HTM Unrealized Losses 2,109 1,634
GNMA [Member] | Residential MBS [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
HTM Fair Value Less than 12 months 16,719 18,188
HTM Unrealized Losses Less than 12 months 1,046 943
HTM Fair Value 12 months or more 0 0
HTM Unrealized Losses 12 months or more 0 0
HTM Fair Value 16,719 18,188
HTM Unrealized Losses 1,046 943
FNMA [Member] | Residential MBS [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
HTM Fair Value Less than 12 months 66,795 69,192
HTM Unrealized Losses Less than 12 months 3,161 3,155
HTM Fair Value 12 months or more 0 0
HTM Unrealized Losses 12 months or more 0 0
HTM Fair Value 66,795 69,192
HTM Unrealized Losses 3,161 3,155
CMOs issued or guaranteed by the FHLMC, FNMA, and GNMA: [Member] | Residential MBS [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
HTM Fair Value Less than 12 months 28,539 33,032
HTM Unrealized Losses Less than 12 months 1,658 1,424
HTM Fair Value 12 months or more 0 0
HTM Unrealized Losses 12 months or more 0 0
HTM Fair Value 28,539 33,032
HTM Unrealized Losses 1,658 1,424
Puerto Rico [Member] | Municipal Bonds [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
HTM Fair Value Less than 12 months 0 0
HTM Unrealized Losses Less than 12 months 0 0
HTM Fair Value 12 months or more 107,673 98,797
HTM Unrealized Losses 12 months or more 3,858 2,769
HTM Fair Value 107,673 98,797
HTM Unrealized Losses $ 3,858 $ 2,769