INVESTMENT SECURITIES - Amortized cost and fair value of securities held-to-maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Investment securities held-to-maturity:
Amortized Cost	$ 77,540		$ 81,056
Gross Unrecognized Gains	11		13
Gross Unrecognized Losses	(8,000)		(6,351)
Fair Value	69,551		74,718
Allowance for credit losses: held-to-maturity securities	(71)		0
U.S. Treasury debt
Investment securities held-to-maturity:
Amortized Cost	247		243
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(10)		(9)
Fair Value	237		234
Allowance for credit losses: held-to-maturity securities	0
Corporate bonds
Investment securities held-to-maturity:
Amortized Cost	23,758		23,819
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(3,507)		(2,453)
Fair Value	20,251		21,366
Allowance for credit losses: held-to-maturity securities	(71)	$ (71)	0
GNMA mortgage-backed securities – residential
Investment securities held-to-maturity:
Amortized Cost	36,921		39,426
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(3,278)		(2,800)
Fair Value	33,643		36,626
Allowance for credit losses: held-to-maturity securities	0
FNMA mortgage-backed securities – residential
Investment securities held-to-maturity:
Amortized Cost	6,370		6,708
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(545)		(506)
Fair Value	5,825		6,202
Allowance for credit losses: held-to-maturity securities	0
Government CMO and MBS - commercial
Investment securities held-to-maturity:
Amortized Cost	6,293		6,786
Gross Unrecognized Gains	11		13
Gross Unrecognized Losses	(412)		(403)
Fair Value	5,892		6,396
Allowance for credit losses: held-to-maturity securities	0
Corporate CMO and MBS
Investment securities held-to-maturity:
Amortized Cost	3,951		4,074
Gross Unrecognized Gains	0		0
Gross Unrecognized Losses	(248)		(180)
Fair Value	3,703		3,894
Allowance for credit losses: held-to-maturity securities	$ 0	$ 0	$ 0