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SUBORDINATED NOTES (Details) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 15, 2021 | Sep. 10, 2020 | Jun. 10, 2020 | Aug. 08, 2016 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
SUBORDINATED NOTES |  |  |  |  |  |  |  |
Subordinated note interest rate |  |  | 5.50% |  |  |  |  |
Senior Subordinated Notes |  |  |  |  |  |  |  |
SUBORDINATED NOTES |  |  |  |  |  |  |  |
Public offering and sale of subordinated notes |  | $ 75,000,000.0 |  |  |  |  |  |
Subordinated note interest rate |  |  |  | 5.25% |  |  |  |
Proceeds from issuance of senior long-term debt |  |  | $ 73,500,000 | $ 73,500,000 |  |  |  |
Deferred debt issuance costs |  |  | $ 1,500,000 | $ 1,500,000 |  |  |  |
Expected life of the notes |  |  | 5 years | 5 years |  |  |  |
Principal amount redeemed | $ 75,000,000.0 |  |  |  |  |  |  |
Redemption price as percentage of aggregate principal balance | 100.00% |  |  |  |  |  |  |
Amortization of the debt issuance costs |  |  |  |  | $ 74,000 | $ 146,000 | $ 223,000 | $ 512,000
Subordinated borrowing, interest rate |  |  |  |  |  |  | 5.96% |
Senior Subordinated Notes | SOFR |  |  |  |  |  |  |  |
SUBORDINATED NOTES |  |  |  |  |  |  |  |
Spread on variable rate |  | 5.325% |  |  |  |  |  |
Senior Subordinated Notes | 90-day LIBOR |  |  |  |  |  |  |  |
SUBORDINATED NOTES |  |  |  |  |  |  |  |
Spread on variable rate |  |  |  | 4.087% |  |  |  |

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