Quarterly report [Sections 13 or 15(d)]

SEGMENT REPORTING AND REVENUE (Operating Segment Results) (Details)

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SEGMENT REPORTING AND REVENUE (Operating Segment Results) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended 15 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2026
USD ($)
segment
Dec. 31, 2025
USD ($)
Apr. 01, 2025
USD ($)
Disaggregation of Revenue [Line Items]            
Number of operating segments | segment       2    
Interest and dividend income $ 471,735 $ 305,836        
Interest expense 159,362 121,672        
Net interest income 312,373 184,164        
Provision for credit losses 2,737 17,638        
Net interest income after provision for credit losses 309,636 166,526        
Noninterest income 54,783 29,163        
Noninterest expenses 209,810 134,184        
Income (loss) before income taxes 154,609 61,505        
LHFI, net of unearned income 27,946,424   $ 27,946,424 $ 27,946,424 $ 27,796,167  
Goodwill 1,754,875   1,754,875 1,754,875 1,733,287  
Deposits 30,391,256   30,391,256 30,391,256 30,471,636  
Sandy Spring            
Disaggregation of Revenue [Line Items]            
Goodwill 540,800   540,800 540,800   $ 540,821
Goodwill, measurement period adjustments     44,000      
Wholesale Banking | Sandy Spring            
Disaggregation of Revenue [Line Items]            
Goodwill 431,700   431,700 431,700    
Consumer Banking | Sandy Spring            
Disaggregation of Revenue [Line Items]            
Goodwill 109,100   109,100 109,100    
Operating segments | Wholesale Banking            
Disaggregation of Revenue [Line Items]            
Interest and dividend income 426,119 296,987        
Interest expense 265,241 197,647        
Net interest income 160,878 99,340        
Provision for credit losses 280 15,045        
Net interest income after provision for credit losses 160,598 84,295        
Noninterest income 28,944 11,799        
Noninterest expenses 93,790 55,212        
Income (loss) before income taxes 95,752 40,882        
LHFI, net of unearned income 23,294,363   23,294,363 23,294,363 23,179,687  
Goodwill 1,281,726   1,281,726 1,281,726 1,254,979  
Deposits 11,878,174   11,878,174 11,878,174 11,339,236  
Operating segments | Wholesale Banking | Sandy Spring            
Disaggregation of Revenue [Line Items]            
Goodwill, measurement period adjustments 26,700          
Operating segments | Consumer Banking            
Disaggregation of Revenue [Line Items]            
Interest and dividend income 231,232 156,143        
Interest expense 122,083 80,359        
Net interest income 109,149 75,784        
Provision for credit losses 2,007 2,593        
Net interest income after provision for credit losses 107,142 73,191        
Noninterest income 18,353 14,634        
Noninterest expenses 104,996 67,567        
Income (loss) before income taxes 20,499 20,258        
LHFI, net of unearned income 5,309,769   5,309,769 5,309,769 5,317,949  
Goodwill 473,149   473,149 473,149 478,308  
Deposits 17,738,197   17,738,197 17,738,197 17,820,026  
Operating segments | Consumer Banking | Sandy Spring            
Disaggregation of Revenue [Line Items]            
Goodwill, measurement period adjustments (5,200)          
Corporate Other            
Disaggregation of Revenue [Line Items]            
Interest and dividend income (185,616) (147,294)        
Interest expense (227,962) (156,334)        
Net interest income 42,346 9,040        
Provision for credit losses 450 0        
Net interest income after provision for credit losses 41,896 9,040        
Noninterest income 7,486 2,730        
Noninterest expenses 11,024 11,405        
Income (loss) before income taxes 38,358 $ 365        
LHFI, net of unearned income (657,708)   (657,708) (657,708) (701,469)  
Goodwill 0   0 0 0  
Deposits $ 774,885   $ 774,885 $ 774,885 $ 1,312,374