Annual report [Section 13 and 15(d), not S-K Item 405]

STOCKHOLDERS' EQUITY (Narrative) (Details)

v3.25.0.1
STOCKHOLDERS' EQUITY (Narrative) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 21, 2024
USD ($)
$ / shares
shares
Dec. 09, 2022
USD ($)
shares
Jun. 09, 2020
$ / shares
shares
Dec. 31, 2024
USD ($)
item
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Preferred stock, shares authorized       500,000 500,000  
Issuance of common stock | $       $ 228 $ 778 $ 3,875
Dilutive effect of stock awards and equity forwards       1,759,000 1,000 4,000
Number of active share repurchase programs | item       0    
Stock repurchase program, number of shares repurchased   1,300,000        
Stock repurchase program, shares repurchased amount | $   $ 48,200        
Preferred stock, shares outstanding       17,250 17,250  
Sandy Spring [Member] | Morgan Stanley & Co. LLC [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shares issued and sold 9,859,155          
Underwriter granted option period 30 days          
Proceeds from sale of common stock, settlement period 18 months          
Issuance of common stock | $ $ 386,400          
Dilutive effect of stock awards and equity forwards       1,759,194    
Number of stocks option, granted 1,478,873          
Sandy Spring [Member] | Morgan Stanley & Co. LLC [Member] | Maximum [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Sale of price per share | $ / shares $ 35.5          
Sandy Spring [Member] | Morgan Stanley & Co. LLC [Member] | Minimum [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Sale of price per share | $ / shares $ 34.08          
Depositary Shares            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Shares issued and sold     6,900,000      
Number of shares to be purchased upon the exercise of options     900,000      
Preferred stock, liquidation preference (usd per share) | $ / shares     $ 25      
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) | $ / shares     $ 10,000