Quarterly report [Sections 13 or 15(d)]

ACQUISITIONS (Consideration Transferred) (Details)

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ACQUISITIONS (Consideration Transferred) (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2025
Jun. 30, 2025
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Business Acquisition [Line Items]          
Purchase price consideration   $ 1,275,247      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]          
Total assets   12,988,972 $ 0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Total liabilities   $ 12,209,862 0    
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