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, 2024
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Business Acquisition [Line Items]            
Purchase price consideration   $ 1,275,247 $ 505,746      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]            
Preliminary goodwill       $ 1,726,386 $ 1,214,053  
American National            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]            
Total assets           $ 2,948,035
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]            
Total liabilities           $ 2,730,061
Preliminary goodwill         $ 288,842  
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 AFS 1,266,925          
Restricted Stock 68,310          
LHFI 8,611,931          
Premises and equipment 59,402          
Core deposit intangibles and other intangibles 290,650          
Bank owned life insurance 170,482          
Lease right of use asset 40,808          
Other assets 327,088          
Total assets 12,974,597     12,974,597    
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 109,269          
Total liabilities 12,210,961     12,210,961    
Fair value of net assets acquired 763,636          
Preliminary goodwill 512,333     $ 512,333    
Sandy Spring | CRE            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]            
LHFS 1,839,638          
Sandy Spring | Non-CRE            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]            
LHFS $ 29,152