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SUBORDINATED NOTES (Details) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 15, 2021 | Jun. 10, 2020 | Aug. 16, 2016 | Aug. 08, 2016 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Public Offering And Sale Of Subordinated Notes |  |  | $ 75,000,000.0 |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  | $ 146,000 | $ 186,000 | $ 512,000 | $ 428,000
Subordinated Note Interest Rate |  | 5.50% |  | 5.25% |  |  |  |
Subordinated Borrowing, Interest Rate |  |  |  |  |  |  | 5.98% |
Senior Subordinated Notes |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Public Offering And Sale Of Subordinated Notes |  | $ 75,000,000.0 |  |  |  |  |  |
Proceeds from Issuance of Senior Long-term Debt |  | 73,500,000 |  | $ 73,500,000 |  |  |  |
Payment of Financing and Stock Issuance Costs |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  |
Spread on variable rate |  | 5.325% |  |  |  |  |  |
Redemption price as percentage of aggregate principal balance | 100.00% |  |  |  |  |  |  |
Expected life of the notes |  | 5 years |  | 5 years |  |  |  |
Aggregate principal amount | $ 75,000,000.0 |  |  |  |  |  |  |
Senior Subordinated Notes | 90-day LIBOR |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Spread on variable rate |  |  |  | 4.087% |  |  |  |

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