Quarterly report [Sections 13 or 15(d)]

GOODWILL AND INTANGIBLE ASSETS (Schedule of Information Concerning Intangible Assets with Finite Life) (Details)

v3.25.3
GOODWILL AND INTANGIBLE ASSETS (Schedule of Information Concerning Intangible Assets with Finite Life) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Apr. 01, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Gross Carrying Value $ 1,214,053   $ 925,211
Goodwill 1,726,386   1,214,053
Gross Carrying Value 1,726,386   1,214,053
Accumulated Amortization, Goodwill 0   0
Total estimated amortization expense 333,236    
American National      
Finite-Lived Intangible Assets [Line Items]      
Goodwill     288,842
Sandy Spring      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 512,333 $ 512,333  
CDIs      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value 153,740   85,491
Accumulated Amortization (116,136)   (85,768)
Total estimated amortization expense 280,955   74,133
CDIs | American National      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value     74,410
CDIs | Sandy Spring      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value 243,351    
Other amortizable intangibles      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value 14,254   3,977
Accumulated Amortization (9,272)   (3,824)
Total estimated amortization expense 52,281   10,430
Other amortizable intangibles | American National      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value     $ 10,277
Other amortizable intangibles | Sandy Spring      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value $ 47,299