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INVESTMENT SECURITIES - Amortized cost and fair value of securities held-to-maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	$ 78,998		$ 74,173
Gross Unrecognized Gains	40		9
Gross Unrecognized Losses	(7,971)		(7,565)
Fair Value	71,067		66,617
Allowance for Credit Losses	(71)		(71)
U.S. Treasury debt
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	268		253
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(20)		(11)
Fair Value	248		242
Allowance for Credit Losses	0		0
Corporate bonds
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	23,656		23,687
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(3,168)		(3,020)
Fair Value	20,488		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	33,208		34,579
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(3,559)		(3,410)
Fair Value	29,649		31,169
Allowance for Credit Losses	0		0
Federal National Mortgage Association ("FNMA") MBS – residential
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	12,805		6,035
Gross Unrecognized Gains	31		0
Gross Unrecognized Losses	(567)		(509)
Fair Value	12,269		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	5,429		5,836
Gross Unrecognized Gains	9		9
Gross Unrecognized Losses	(395)		(377)
Fair Value	5,043		5,468
Allowance for Credit Losses	0		0
Corporate collateralized mortgage obligations ("CMO") and MBS(1)
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized Cost	3,632		3,783
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(262)		(238)
Fair Value	3,370		3,545
Allowance for Credit Losses	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0