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STOCK-BASED COMPENSATION - Schedule of Stock Appreciation Rights Activity (Details) - SSARs - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Shares    
Outstanding at beginning of period (in shares) 0  
Replacement of CrossFirst SSARs (in shares) 424,390  
Exercised (in shares) (119,842)  
Forfeited (in shares) (4,005)  
Expired (in shares) (30,145)  
Outstanding at end of period (in shares) 270,398  
Exercisable (in shares) 249,747  
Weighted- Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 0  
Replacement of CrossFirst SSARs (in dollars per share) 15.78  
Exercised (in dollars per shares) 13.31  
Forfeited (in dollars per shares) 16.00  
Expired (in dollars per shares) 23.23  
Outstanding at ending of period (in dollars per share) 16.04  
Exercisable (in dollars per share) $ 15.62  
Weighted- Average Remaining Contractual Term    
Weighted- Average Remaining Contractual Term 5 years 2 months 23 days  
Weighted- Average Remaining Contractual Term, Exercisable (in years) 5 years 2 months 1 day  
Intrinsic value, options outstanding $ 1,922 $ 0
Intrinsic value, exercisable at end of year 1,881  
Aggregate intrinsic value of SSARs exercised $ 1,100