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STOCK-BASED COMPENSATION - Stock Settled Appreciation Rights (Details) - SSARs - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Mar. 01, 2025 | Sep. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Fair value of SSARs that have vested |  | $ 3.6
CrossFirst | Common | CrossFirst |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Shares received for each share owned (in shares) | 0.6675 |
Omnibus Incentive 2018 Plan |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Vesting period |  | 7 years
Weighted average remaining contractual term |  | 5 years 4 months 24 days
Period over which cost will be recognized |  | 3 years 2 months 12 days
Omnibus Incentive 2018 Plan | Minimum |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Share-based compensation, expiration period |  | 10 years
Omnibus Incentive 2018 Plan | Maximum |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Share-based compensation, expiration period |  | 15 years

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