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 9 Months Ended 21 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Apr. 01, 2025
USD ($)
Dec. 31, 2024
USD ($)
Disaggregation of Revenue [Line Items]              
Number of operating segments | segment         2    
Interest and dividend income $ 503,437 $ 324,528 $ 1,319,645 $ 908,330      
Interest expense 184,227 141,596 494,900 393,040      
Net interest income 319,210 182,932 824,745 515,290      
Provision for credit losses 16,233 2,603 139,578 32,592      
Net interest income after provision for credit losses 302,977 180,329 685,167 482,698      
Noninterest income 51,751 34,286 162,436 83,651      
Noninterest expenses 238,446 122,582 652,327 377,859      
Income (loss) before income taxes 116,282 92,033 195,276 188,490      
LHFI, net of deferred fees and costs 27,361,173   27,361,173   $ 27,361,173   $ 18,470,621
Goodwill 1,726,386   1,726,386   1,726,386   1,214,053
Deposits 30,665,324   30,665,324   30,665,324   20,397,619
American National              
Disaggregation of Revenue [Line Items]              
Goodwill             288,842
Sandy Spring              
Disaggregation of Revenue [Line Items]              
Goodwill 512,333   512,333   512,333 $ 512,333  
Wholesale Banking | Sandy Spring              
Disaggregation of Revenue [Line Items]              
Goodwill 399,600   399,600   399,600    
Consumer Banking | Sandy Spring              
Disaggregation of Revenue [Line Items]              
Goodwill 112,700   112,700   112,700    
Operating segments | Wholesale Banking              
Disaggregation of Revenue [Line Items]              
Interest and dividend income 454,493 323,446 1,194,795 911,660      
Interest expense 293,637 222,349 776,220 634,741      
Net interest income 160,856 101,097 418,575 276,919      
Provision for credit losses 14,368 217 109,435 25,803      
Net interest income after provision for credit losses 146,488 100,880 309,140 251,116      
Noninterest income 29,000 10,773 64,450 29,913      
Noninterest expenses 92,982 50,521 232,787 142,926      
Income (loss) before income taxes 82,506 61,132 140,803 138,103      
LHFI, net of deferred fees and costs 22,852,155   22,852,155   22,852,155   15,514,640
Goodwill 1,249,654   1,249,654   1,249,654   850,035
Deposits 11,548,604   11,548,604   11,548,604   7,193,403
Operating segments | Wholesale Banking | Sandy Spring              
Disaggregation of Revenue [Line Items]              
Goodwill 399,600   399,600   399,600    
Operating segments | Consumer Banking              
Disaggregation of Revenue [Line Items]              
Interest and dividend income 252,031 165,012 656,655 455,769      
Interest expense 137,295 85,900 353,285 231,411      
Net interest income 114,736 79,112 303,370 224,358      
Provision for credit losses 1,858 2,389 30,136 6,801      
Net interest income after provision for credit losses 112,878 76,723 273,234 217,557      
Noninterest income 19,945 15,721 54,240 43,589      
Noninterest expenses 108,850 64,694 274,932 185,672      
Income (loss) before income taxes 23,973 27,750 52,542 75,474      
LHFI, net of deferred fees and costs 5,257,652   5,257,652   5,257,652   3,085,207
Goodwill 476,732   476,732   476,732   364,018
Deposits 17,958,684   17,958,684   17,958,684   11,899,197
Operating segments | Consumer Banking | Sandy Spring              
Disaggregation of Revenue [Line Items]              
Goodwill 112,700   112,700   112,700    
Corporate Other              
Disaggregation of Revenue [Line Items]              
Interest and dividend income (203,087) (163,930) (531,805) (459,099)      
Interest expense (246,705) (166,653) (634,605) (473,112)      
Net interest income 43,618 2,723 102,800 14,013      
Provision for credit losses 7 (3) 7 (12)      
Net interest income after provision for credit losses 43,611 2,726 102,793 14,025      
Noninterest income 2,806 7,792 43,746 10,149      
Noninterest expenses 36,614 7,367 144,608 49,261      
Income (loss) before income taxes 9,803 $ 3,151 1,931 $ (25,087)      
LHFI, net of deferred fees and costs (748,634)   (748,634)   (748,634)   (129,226)
Goodwill 0   0   0   0
Deposits $ 1,158,036   $ 1,158,036   $ 1,158,036   $ 1,305,019