Quarterly report [Sections 13 or 15(d)]

LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES (Schedule for Allowance for Loan Loss Activity, by Portfolio Segment, Balances for Allowance for Credit Losses, and Loans Based on Impairment Methodology) (Details)

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LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES (Schedule for Allowance for Loan Loss Activity, by Portfolio Segment, Balances for Allowance for Credit Losses, and Loans Based on Impairment Methodology) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 01, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Allowance for loan losses:          
Balance, beginning of period   $ 315,574 $ 158,131 $ 178,644 $ 132,182
Loans charged off   (40,440) (2,719) (45,905) (11,701)
Recoveries credited to allowance   1,847 2,053 4,368 4,378
Provision charged to operations   16,054 3,220 38,125 18,701
Balance, end of period   293,035 160,685 293,035 160,685
American National          
Allowance for loan losses:          
Initial ACL at acquisition     0   (3,896)
Initial Provision - non-PCD loans     0   13,229
Sandy Spring          
Allowance for loan losses:          
Initial ACL at acquisition   0   (28,265)  
Initial Provision - non-PCD loans   0   89,538  
Initial ACL recognized charge offs before acquisition $ 53,500 53,500   53,500  
Measurement period adjustment   19,000   19,000  
Sandy Spring | PCD          
Allowance for loan losses:          
Initial ACL at acquisition $ (28,265)        
Commercial Portfolio Segment [Member]          
Allowance for loan losses:          
Balance, beginning of period   257,403 131,139 148,887 105,896
Loans charged off   (39,575) (1,642) (42,958) (8,675)
Recoveries credited to allowance   1,223 1,292 2,999 2,881
Provision charged to operations   14,708 1,931 38,836 18,796
Balance, end of period   233,759 132,720 233,759 132,720
Commercial Portfolio Segment [Member] | American National          
Allowance for loan losses:          
Initial ACL at acquisition     0   (2,609)
Initial Provision - non-PCD loans     0   11,213
Commercial Portfolio Segment [Member] | Sandy Spring          
Allowance for loan losses:          
Initial ACL at acquisition   0   (21,255)  
Initial Provision - non-PCD loans   0   64,740  
Consumer Portfolio Segment [Member]          
Allowance for loan losses:          
Balance, beginning of period   58,171 26,992 29,757 26,286
Loans charged off   (865) (1,077) (2,947) (3,026)
Recoveries credited to allowance   624 761 1,369 1,497
Provision charged to operations   1,346 1,289 (711) (95)
Balance, end of period   59,276 27,965 59,276 27,965
Consumer Portfolio Segment [Member] | American National          
Allowance for loan losses:          
Initial ACL at acquisition     0   (1,287)
Initial Provision - non-PCD loans     $ 0   $ 2,016
Consumer Portfolio Segment [Member] | Sandy Spring          
Allowance for loan losses:          
Initial ACL at acquisition   0   (7,010)  
Initial Provision - non-PCD loans   $ 0   $ 24,798