DEBT SECURITIES - Investments Securities Held to Maturity (Securities in continuous unrealized loss position) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Held To Maturity Securities [Line Items]
HTM Fair Value Less than 12 months	$ 0	$ 260,106
HTM Unrealized Losses Less than 12 months	0	11,721
HTM Fair Value 12 months or more	266,963	98,797
HTM Unrealized Losses 12 months or more	21,137	2,769
HTM Fair Value	266,963	358,903
HTM Unrealized Losses	21,137	14,490
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	34,244	98,797
HTM Unrealized Losses 12 months or more	1,405	2,769
HTM Fair Value	34,244	98,797
HTM Unrealized Losses	1,405	2,769
Commercial MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
HTM Fair Value Less than 12 months	0	100,523
HTM Unrealized Losses Less than 12 months	0	4,565
HTM Fair Value 12 months or more	94,103	0
HTM Unrealized Losses 12 months or more	7,698	0
HTM Fair Value	94,103	100,523
HTM Unrealized Losses	7,698	4,565
FHLMC [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
HTM Fair Value Less than 12 months	0	39,171
HTM Unrealized Losses Less than 12 months	0	1,634
HTM Fair Value 12 months or more	33,500	0
HTM Unrealized Losses 12 months or more	2,820	0
HTM Fair Value	33,500	39,171
HTM Unrealized Losses	2,820	1,634
GNMA [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
HTM Fair Value Less than 12 months	0	18,188
HTM Unrealized Losses Less than 12 months	0	943
HTM Fair Value 12 months or more	15,372	0
HTM Unrealized Losses 12 months or more	1,414	0
HTM Fair Value	15,372	18,188
HTM Unrealized Losses	1,414	943
FNMA [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
HTM Fair Value Less than 12 months	0	69,192
HTM Unrealized Losses Less than 12 months	0	3,155
HTM Fair Value 12 months or more	62,486	0
HTM Unrealized Losses 12 months or more	5,902	0
HTM Fair Value	62,486	69,192
HTM Unrealized Losses	5,902	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	0	33,032
HTM Unrealized Losses Less than 12 months	0	1,424
HTM Fair Value 12 months or more	27,258	0
HTM Unrealized Losses 12 months or more	1,898	0
HTM Fair Value	27,258	33,032
HTM Unrealized Losses	$ 1,898	$ 1,424