Quarterly report [Sections 13 or 15(d)]

ACQUISITIONS (Consideration Transferred) (Details)

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ACQUISITIONS (Consideration Transferred) (Details) - USD ($)
$ in Thousands
Apr. 01, 2025
Mar. 31, 2026
Dec. 31, 2025
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Preliminary goodwill   $ 1,754,875 $ 1,733,287
Sandy Spring      
Business Acquisition [Line Items]      
Purchase price consideration $ 1,275,969    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Cash and cash equivalents 270,211    
Securities available for sale ("AFS") 1,266,925    
Restricted Stock 68,310    
LHFI 8,572,384    
Premises and equipment 59,402    
Core deposit intangible ("CDI") and other intangibles 290,650    
Bank owned life insurance ("BOLI") 170,482    
Lease right of use ("ROU") asset 40,808    
Other assets 337,509    
Total assets 12,945,471    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Deposits 11,227,922    
Short-term borrowings 272,201    
Long-term borrowings 560,761    
Lease liabilities 40,808    
Other liabilities 108,631    
Total liabilities 12,210,323    
Fair value of net assets acquired 735,148    
Preliminary goodwill 540,821 $ 540,800  
Sandy Spring | CRE      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Loans held for sale ("LHFS") 1,839,638    
Sandy Spring | Non-CRE      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Loans held for sale ("LHFS") $ 29,152