Quarterly report [Sections 13 or 15(d)]

STOCKHOLDERS' EQUITY (Narrative) (Details)

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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 5 Months Ended 9 Months Ended
May 05, 2026
Apr. 01, 2025
Oct. 21, 2024
Jun. 30, 2025
Sep. 30, 2026
Sep. 30, 2026
Dec. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Preferred stock, shares authorized         500,000 500,000 500,000
Stock repurchase program, authorized amount $ 250.0            
Stock repurchase program, expiration date May 05, 2027            
Stock repurchase program, remaining authorized repurchase amount         $ 177.5 $ 177.5  
Stock repurchase program, number of shares repurchased         1,800,000    
Stock repurchase program, average cost per share         $ 40.84    
Stock repurchase program, shares repurchased amount         $ 72.5    
Preferred stock, shares issued         17,250 17,250 17,250
Preferred stock, shares outstanding         17,250 17,250 17,250
Morgan Stanley & Co. LLC [Member]              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Shares issued and sold       11,338,028      
Sandy Spring              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Shares issued and sold       41,000,004      
Sandy Spring | Morgan Stanley & Co. LLC [Member]              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Shares issued and sold   11,338,028 9,859,155        
Sale of price per share     $ 35.5        
Proceeds for issuance of common stock   $ 385.0          
Number of stocks option, granted     1,478,873        
Depositary Shares              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Number of shares to be purchased upon the exercise of options         900,000 900,000  
Preferred stock, liquidation preference (usd per share)         $ 25 $ 25  
Preferred stock, shares outstanding         6,900,000 6,900,000  
Series A Preferred Stock [Member]              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Number of preferred stock represented by each depositary share           each representing a 1/400th ownership interest in a share of its Series A preferred stock  
Preferred stock, liquidation preference (usd per share)         $ 10,000 $ 10,000  
Preferred stock, dividend rate           6.875%