Quarterly report [Sections 13 or 15(d)]

SEGMENT REPORTING AND REVENUE (Disaggregation of Noninterest Income by Major Source) (Details)

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SEGMENT REPORTING AND REVENUE (Disaggregation of Noninterest Income by Major Source) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue        
Service charges on deposit accounts $ 12,838 $ 9,792 $ 34,743 $ 27,447
Other service charges, commissions and fees 2,325 2,002 6,332 5,700
Interchange fees 4,089 3,371 10,816 8,791
Fiduciary and asset management fees 18,595 6,858 43,014 18,603
Mortgage banking income 2,811 1,214 6,605 3,274
Loss (gain) on sale of securities 4 4 (83) (6,510)
Bank owned life insurance income 5,116 5,037 15,979 12,074
Loan-related interest rate swap fees 5,911 1,503 10,043 4,353
Other operating income 62 4,505 34,987 9,919
Total noninterest income 51,751 34,286 162,436 83,651
Gain on CRE loan sale     10,915 0
Overdraft fees        
Disaggregation of Revenue        
Service charges on deposit accounts 6,396 5,800 18,036 15,649
Maintenance fees & other        
Disaggregation of Revenue        
Service charges on deposit accounts 6,442 3,992 16,707 11,798
Trust asset management fees        
Disaggregation of Revenue        
Fiduciary and asset management fees 8,730 3,624 20,542 10,761
Registered advisor management fees        
Disaggregation of Revenue        
Fiduciary and asset management fees 7,240 5 14,143 11
Brokerage management fees, net        
Disaggregation of Revenue        
Fiduciary and asset management fees 2,625 3,229 8,329 7,831
Product and Service, Other [Member]        
Disaggregation of Revenue        
Other service charges, commissions and fees 2,325 2,002 6,332 5,700
Cary Street Partners, LLC        
Disaggregation of Revenue        
Gain on sale of equity interests in Cary Street Partners LLC ("CSP")     14,300 0
Sandy Spring | Commercial Real Estate        
Disaggregation of Revenue        
Gain on CRE loan sale (4,800)   10,900  
Operating segments | Wholesale Banking        
Disaggregation of Revenue        
Service charges on deposit accounts 4,537 2,833 11,818 8,178
Other service charges, commissions and fees 813 600 1,717 1,413
Fiduciary and asset management fees 16,548 4,933 37,076 13,301
Mortgage banking income 0 0 0 0
Total noninterest income 29,000 10,773 64,450 29,913
Operating segments | Consumer Banking        
Disaggregation of Revenue        
Service charges on deposit accounts 8,301 6,959 22,925 19,269
Other service charges, commissions and fees 1,437 1,402 4,426 4,304
Fiduciary and asset management fees 2,047 1,925 5,938 5,302
Mortgage banking income 2,811 1,214 6,605 3,274
Total noninterest income 19,945 15,721 54,240 43,589
Corporate Other        
Disaggregation of Revenue        
Service charges on deposit accounts 0 0 0 0
Other service charges, commissions and fees 75 0 189 (17)
Fiduciary and asset management fees 0 0 0 0
Mortgage banking income 0 0 0 0
Loss (gain) on sale of securities       (6,500)
Total noninterest income $ 2,806 $ 7,792 $ 43,746 $ 10,149