Quarterly report [Sections 13 or 15(d)]

GOODWILL AND INTANGIBLE ASSETS (Schedule of Goodwill and Intangible Assets by Operating Segment) (Details)

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GOODWILL AND INTANGIBLE ASSETS (Schedule of Goodwill and Intangible Assets by Operating Segment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Apr. 01, 2025
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 1,754,875 $ 1,733,287  
Intangible Assets 300,099 315,544  
Sandy Spring      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 540,800   $ 540,821
Wholesale Banking | Sandy Spring      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 431,700    
Consumer Banking | Sandy Spring      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 109,100    
Operating segments | Wholesale Banking      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 1,281,726 1,254,979  
Intangible Assets 49,719 50,916  
Operating segments | Consumer Banking      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 473,149 478,308  
Intangible Assets 598 621  
Corporate Other      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 0 0  
Intangible Assets $ 249,782 $ 264,007