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
Sep. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 2025
Business Acquisition [Line Items]            
Purchase price consideration   $ 1,275,247        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]            
Total assets     $ 0     $ 12,974,597
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]            
Total liabilities     0     $ 12,210,961
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