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DEBT SECURITIES - Investment Securities Held to Maturity (Securities in continuous unrealized loss position) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
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 266,245 269,921
HTM Unrealized Losses 12 months or more 9,634 12,857
HTM Fair Value 266,245 269,921
HTM Unrealized Losses 9,634 12,857
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 43,997 34,682
HTM Unrealized Losses 12 months or more 866 958
HTM Fair Value 43,997 34,682
HTM Unrealized Losses 866 958
Commercial MBS [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 91,985 94,590
HTM Unrealized Losses 12 months or more 5,179 6,080
HTM Fair Value 91,985 94,590
HTM Unrealized Losses 5,179 6,080
FHLMC [Member] | Residential MBS [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 29,667 33,523
HTM Unrealized Losses 12 months or more 698 1,270
HTM Fair Value 29,667 33,523
HTM Unrealized Losses 698 1,270
GNMA [Member] | Residential MBS [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 13,881 15,476
HTM Unrealized Losses 12 months or more 432 789
HTM Fair Value 13,881 15,476
HTM Unrealized Losses 432 789
FNMA [Member] | Residential MBS [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 61,209 64,785
HTM Unrealized Losses 12 months or more 1,545 2,486
HTM Fair Value 61,209 64,785
HTM Unrealized Losses 1,545 2,486
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 0 0
HTM Unrealized Losses Less than 12 months 0 0
HTM Fair Value 12 months or more 25,506 26,865
HTM Unrealized Losses 12 months or more 914 1,274
HTM Fair Value 25,506 26,865
HTM Unrealized Losses $ 914 $ 1,274