DEBT SECURITIES - Investments Securities Held to Maturity (Securities in continuous unrealized loss position) (Detail) - USD ($) $ in Thousands	Mar. 31, 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	259,362	269,921
HTM Unrealized Losses 12 months or more	15,085	12,857
HTM Fair Value	259,362	269,921
HTM Unrealized Losses	15,085	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	31,125	34,682
HTM Unrealized Losses 12 months or more	1,120	958
HTM Fair Value	31,125	34,682
HTM Unrealized Losses	1,120	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	93,209	94,590
HTM Unrealized Losses 12 months or more	6,316	6,080
HTM Fair Value	93,209	94,590
HTM Unrealized Losses	6,316	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	31,851	33,523
HTM Unrealized Losses 12 months or more	1,651	1,270
HTM Fair Value	31,851	33,523
HTM Unrealized Losses	1,651	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	14,739	15,476
HTM Unrealized Losses 12 months or more	910	789
HTM Fair Value	14,739	15,476
HTM Unrealized Losses	910	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	62,605	64,785
HTM Unrealized Losses 12 months or more	3,504	2,486
HTM Fair Value	62,605	64,785
HTM Unrealized Losses	3,504	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	25,833	26,865
HTM Unrealized Losses 12 months or more	1,584	1,274
HTM Fair Value	25,833	26,865
HTM Unrealized Losses	$ 1,584	$ 1,274