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INVESTMENT SECURITIES - Cost basis and fair values of investment securities (Details) - USD ($)	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	$ 184,018,000		$ 198,417,000
Investment securities available for sale, Gross Unrealized Gains	226,000		95,000
Investment securities available for sale, Gross Unrealized Losses	(17,607,000)		(19,004,000)
Investment securities available for sale, Allowance for credit losses	(926,000)
Available for Sale, Fair Value	165,711,000		179,508,000
Investment securities held to maturity, Cost Basis	63,979,000		61,878,000
Investment securities held to maturity, Gross Unrealized Gains	49,000		10,000
Investment securities held to maturity, Gross Unrealized Losses	(5,407,000)		(6,696,000)
Investment securities held to maturity, Allowance for credit losses	(37,000)	$ (114,000)
Investment securities held to maturity, Fair value	58,621,000		55,192,000
U.S. Agency
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	6,035,000		11,797,000
Investment securities available for sale, Gross Unrealized Gains			1,000
Investment securities available for sale, Gross Unrealized Losses	(696,000)		(1,265,000)
Available for Sale, Fair Value	5,339,000		10,533,000
Investment securities held to maturity, Cost Basis	2,500,000		2,500,000
Investment securities held to maturity, Gross Unrealized Losses	(379,000)		(432,000)
Investment securities held to maturity, Allowance for credit losses	0
Investment securities held to maturity, Fair value	2,121,000		2,068,000
U.S. Agency mortgage-backed securities
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	104,820,000		102,631,000
Investment securities available for sale, Gross Unrealized Gains	179,000		64,000
Investment securities available for sale, Gross Unrealized Losses	(11,924,000)		(12,710,000)
Available for Sale, Fair Value	93,075,000		89,985,000
Investment securities held to maturity, Cost Basis	24,222,000		18,877,000
Investment securities held to maturity, Gross Unrealized Gains	49,000		8,000
Investment securities held to maturity, Gross Unrealized Losses	(2,058,000)		(2,212,000)
Investment securities held to maturity, Allowance for credit losses	0
Investment securities held to maturity, Fair value	22,213,000		16,673,000
Municipal
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	11,159,000		20,837,000
Investment securities available for sale, Gross Unrealized Gains	1,000
Investment securities available for sale, Gross Unrealized Losses	(800,000)		(1,799,000)
Available for Sale, Fair Value	10,360,000		19,038,000
Investment securities held to maturity, Cost Basis	32,787,000		33,993,000
Investment securities held to maturity, Gross Unrealized Gains			2,000
Investment securities held to maturity, Gross Unrealized Losses	(2,797,000)		(3,880,000)
Investment securities held to maturity, Allowance for credit losses	(2,000)	(3,000)
Investment securities held to maturity, Fair value	29,990,000		30,115,000
Corporate bonds.
Information concerning investments with unrealized gains and losses
Investment securities available for sale, Cost Basis	62,004,000		63,152,000
Investment securities available for sale, Gross Unrealized Gains	46,000		30,000
Investment securities available for sale, Gross Unrealized Losses	(4,187,000)		(3,230,000)
Investment securities available for sale, Allowance for credit losses	(926,000)
Available for Sale, Fair Value	56,937,000		59,952,000
Investment securities held to maturity, Allowance for credit losses		$ (111,000)
Corporate bonds and other securities
Information concerning investments with unrealized gains and losses
Investment securities held to maturity, Cost Basis	4,470,000		6,508,000
Investment securities held to maturity, Gross Unrealized Losses	(173,000)		(172,000)
Investment securities held to maturity, Allowance for credit losses	(35,000)
Investment securities held to maturity, Fair value	$ 4,297,000		$ 6,336,000

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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