Annual report [Section 13 and 15(d), not S-K Item 405]

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
6 Months Ended 12 Months Ended
Apr. 01, 2025
Apr. 01, 2024
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Allowance for loan losses:          
Balance, beginning of period       $ 178,644 $ 132,182
Loans charged off       (49,864) (15,956)
Recoveries credited to allowance       7,411 7,194
Provision charged to operations       41,114 38,099
Balance, end of period     $ 295,108 295,108 178,644
American National          
Allowance for loan losses:          
Initial allowance - PCD loans   $ 3,896      
American National | PCD          
Allowance for loan losses:          
Initial allowance - PCD loans         3,896
American National | Non-PCD          
Allowance for loan losses:          
Initial Provision - non-PCD loans         13,229
Sandy Spring          
Allowance for loan losses:          
Initial ACL recognized charge offs before acquisition $ 61,800     61,800  
Measurement period adjustment     27,300    
Sandy Spring | PCD          
Allowance for loan losses:          
Initial allowance - PCD loans $ 28,265     28,265  
Sandy Spring | Non-PCD          
Allowance for loan losses:          
Initial Provision - non-PCD loans       89,538  
Commercial Portfolio Segment [Member]          
Allowance for loan losses:          
Balance, beginning of period       148,887 105,896
Loans charged off       (45,999) (11,889)
Recoveries credited to allowance       5,581 5,283
Provision charged to operations       38,349 35,775
Balance, end of period     232,813 232,813 148,887
Commercial Portfolio Segment [Member] | American National | PCD          
Allowance for loan losses:          
Initial allowance - PCD loans         2,609
Commercial Portfolio Segment [Member] | American National | Non-PCD          
Allowance for loan losses:          
Initial Provision - non-PCD loans         11,213
Commercial Portfolio Segment [Member] | Sandy Spring | PCD          
Allowance for loan losses:          
Initial allowance - PCD loans       21,255  
Commercial Portfolio Segment [Member] | Sandy Spring | Non-PCD          
Allowance for loan losses:          
Initial Provision - non-PCD loans       64,740  
Consumer Portfolio Segment [Member]          
Allowance for loan losses:          
Balance, beginning of period       29,757 26,286
Loans charged off       (3,865) (4,067)
Recoveries credited to allowance       1,830 1,911
Provision charged to operations       2,765 2,324
Balance, end of period     $ 62,295 62,295 29,757
Consumer Portfolio Segment [Member] | American National | PCD          
Allowance for loan losses:          
Initial allowance - PCD loans         1,287
Consumer Portfolio Segment [Member] | American National | Non-PCD          
Allowance for loan losses:          
Initial Provision - non-PCD loans         $ 2,016
Consumer Portfolio Segment [Member] | Sandy Spring | PCD          
Allowance for loan losses:          
Initial allowance - PCD loans       7,010  
Consumer Portfolio Segment [Member] | Sandy Spring | Non-PCD          
Allowance for loan losses:          
Initial Provision - non-PCD loans       $ 24,798