v3.26.1
SEGMENT REPORTING AND REVENUE (Operating Segment Results) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
Dec. 31, 2025
USD ($)
Apr. 01, 2025
USD ($)
Disaggregation of Revenue [Line Items]                
Number of operating segments | segment           2    
Interest and dividend income (expense) $ 486,828   $ 510,372 $ 958,563 $ 816,208      
Interest expense (income) 161,710   189,001 321,072 310,672      
Net interest income 325,118   321,371 637,491 505,536      
Provision for credit losses 11,737   105,707 14,475 123,345      
Net interest income after provision for credit losses 313,381   215,664 623,016 382,191      
Noninterest income 90,248   81,522 145,031 110,685      
Noninterest expenses 199,136   279,698 408,946 413,882      
Income (loss) before income taxes 204,493   17,488 359,101 78,994      
LHFI, net of unearned income 28,673,271     28,673,271   $ 28,673,271 $ 27,796,167  
Goodwill 1,754,875     1,754,875   1,754,875 1,733,287  
Deposits 30,468,257     30,468,257   30,468,257 30,471,636  
Sandy Spring                
Disaggregation of Revenue [Line Items]                
Goodwill   $ 540,800           $ 540,821
Wholesale Banking | Sandy Spring                
Disaggregation of Revenue [Line Items]                
Goodwill   431,700            
Goodwill, measurement period adjustments   26,700            
Consumer Banking | Sandy Spring                
Disaggregation of Revenue [Line Items]                
Goodwill   109,100            
Operating segments | Wholesale Banking                
Disaggregation of Revenue [Line Items]                
Interest and dividend income (expense) 441,685   443,315 867,804 740,302      
Interest expense (income) 278,650   284,936 543,892 482,583      
Net interest income 163,035   158,379 323,912 257,719      
Provision for credit losses 5,381   80,022 5,660 95,067      
Net interest income after provision for credit losses 157,654   78,357 318,252 162,652      
Noninterest income 32,866   23,652 61,810 35,451      
Noninterest expenses 90,954   84,593 184,744 139,805      
Income (loss) before income taxes 99,566   17,416 195,318 58,298      
LHFI, net of unearned income 23,837,961     23,837,961   23,837,961 23,179,687  
Goodwill 1,281,726     1,281,726   1,281,726 1,254,979  
Deposits 12,025,991     12,025,991   12,025,991 11,339,236  
Operating segments | Consumer Banking                
Disaggregation of Revenue [Line Items]                
Interest and dividend income (expense) 236,853   248,482 468,085 404,624      
Interest expense (income) 127,728   135,631 249,811 215,990      
Net interest income 109,125   112,851 218,274 188,634      
Provision for credit losses 5,690   25,685 7,698 28,278      
Net interest income after provision for credit losses 103,435   87,166 210,576 160,356      
Noninterest income 19,093   19,661 37,445 34,295      
Noninterest expenses 105,635   98,515 210,631 166,082      
Income (loss) before income taxes 16,893   8,312 37,390 28,569      
LHFI, net of unearned income 5,452,570     5,452,570   5,452,570 5,317,949  
Goodwill 473,149     473,149   473,149 478,308  
Goodwill, measurement period adjustments   $ (5,200)            
Deposits 17,697,300     17,697,300   17,697,300 17,820,026  
Corporate Other                
Disaggregation of Revenue [Line Items]                
Interest and dividend income (expense) (191,710)   (181,425) (377,326) (328,718)      
Interest expense (income) (244,668)   (231,566) (472,631) (387,901)      
Net interest income 52,958   50,141 95,305 59,183      
Provision for credit losses 666   0 1,117 0      
Net interest income after provision for credit losses 52,292   50,141 94,188 59,183      
Noninterest income 38,289   38,209 45,776 40,939      
Noninterest expenses 2,547   96,590 13,571 107,995      
Income (loss) before income taxes 88,034   $ (8,240) 126,393 $ (7,873)      
LHFI, net of unearned income (617,260)     (617,260)   (617,260) (701,469)  
Goodwill 0     0   0 0  
Deposits $ 744,966     $ 744,966   $ 744,966 $ 1,312,374