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INVESTMENT SECURITIES HELD TO MATURITY - Additional information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Apr. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024
INVESTMENT SECURITIES HELD TO MATURITY |  |  |  |  |
Interest rate | 3.49% |  | 3.49% | 3.49% | 3.49%
Line of credit facility |  |  |  |  |
INVESTMENT SECURITIES HELD TO MATURITY |  |  |  |  |
Line of credit facility | $ 10,000,000 | $ 5,000,000 | $ 10,000,000 | $ 10,000,000 |
Interest rate |  | 1.00% |  |  |
Outstanding borrowings | 0 |  | 0 | 0 |
U.S. Treasury Strips |  |  |  |  |
INVESTMENT SECURITIES HELD TO MATURITY |  |  |  |  |
Interest income, accretion on securities |  |  | $ 126,450 | $ 222,440 |
Purchase of debt securities | $ 9,943,694 | $ 9,991,259 |  |  |
Debt securities, maturity period range | 14 to 62 months | 12 to 54 months |  |  |
Debt securities, weighted average yield | 3.70% | 3.90% |  |  |

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