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INVESTMENT SECURITIES - Amortized cost and fair value of securities held-to-maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	$ 76,816		$ 74,173
Gross Unrecognized Gains	152		9
Gross Unrecognized Losses	(6,142)		(7,565)
Fair Value	70,826		66,617
Allowance for Credit Losses	(71)		(71)
U.S. Treasury debt
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	246		253
Gross Unrecognized Gains	2		0
Gross Unrecognized Losses	0		(11)
Fair Value	248		242
Allowance for Credit Losses	0		0
Corporate bonds
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	23,654		23,687
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(2,986)		(3,020)
Fair Value	20,668		20,667
Allowance for Credit Losses	(71)	$ (71)	(71)	$ (71)	$ (71)	$ 0
Government National Mortgage Association ("GNMA") mortgage-backed securities ("MBS") – residential
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	31,605		34,579
Gross Unrecognized Gains	28		0
Gross Unrecognized Losses	(2,437)		(3,410)
Fair Value	29,196		31,169
Allowance for Credit Losses	0		0
Federal National Mortgage Association ("FNMA") MBS – residential
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	12,507		6,035
Gross Unrecognized Gains	112		0
Gross Unrecognized Losses	(345)		(509)
Fair Value	12,274		5,526
Allowance for Credit Losses	0		0
Government collateralized mortgage obligations ("GMO") and MBS – commercial
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	5,205		5,836
Gross Unrecognized Gains	10		9
Gross Unrecognized Losses	(245)		(377)
Fair Value	4,970		5,468
Allowance for Credit Losses	0		0
Corporate collateralized mortgage obligations ("CMO") and MBS
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	3,599		3,783
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(129)		(238)
Fair Value	3,470		3,545
Allowance for Credit Losses	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0