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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
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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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