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GOODWILL AND OTHER INTANGIBLES - Intangible Assets (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Intangible Assets |  | $ 24,810 |  | $ 24,810 |  | $ 11,601
Accumulated Amortization |  | (7,821) |  | (7,821) |  | (7,663)
Net Intangible Assets |  | 16,989 |  | 16,989 |  | 3,938
Amortization of intangible assets |  | 466 | $ 233 | 932 | $ 699 |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |  |  |
2025 |  | 582 |  | 582 |  |
2026 |  | 2,330 |  | 2,330 |  |
2027 |  | 2,330 |  | 2,330 |  |
2028 |  | 2,357 |  | 2,357 |  |
2029 |  | 1,583 |  | 1,583 |  |
2030 |  | 1,398 |  | 1,398 |  |
and thereafter |  | $ 6,409 |  | $ 6,409 |  |
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life |  | 5 years |  | 5 years |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life |  | 11 years |  | 11 years |  |
Guaranty Bancorp, Inc. |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Average life | 10 years |  |  |  |  |
Core deposit intangible |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Intangible Assets |  | $ 22,691 |  | $ 22,691 |  | 9,483
Accumulated Amortization |  | (6,435) |  | (6,435) |  | (6,423)
Net Intangible Assets |  | 16,256 |  | $ 16,256 |  | 3,060
Core deposit intangible | Guaranty Bancorp, Inc. |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets acquired |  | 14,000 |  |  |  |
Average life |  |  |  | 10 years |  |
Customer list and other intangibles |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Gross Intangible Assets |  | 2,119 |  | $ 2,119 |  | 2,118
Accumulated Amortization |  | (1,386) |  | (1,386) |  | (1,240)
Net Intangible Assets |  | $ 733 |  | $ 733 |  | $ 878

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