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GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Goodwill And Intangible Assets [Line Items]    
Goodwill $ 353,898 $ 241,949
Gross Carrying Amount 142,357 97,831
Accumulated Amortization (90,066) (81,572)
Net Carrying Amount 52,291 16,259
Core deposit intangibles    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 43,578 43,578
Accumulated Amortization (41,456) (40,310)
Net Carrying Amount 2,122 3,268
Customer relationship intangibles    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 66,394 30,014
Accumulated Amortization (26,947) (23,053)
Net Carrying Amount 39,447 6,961
Software intangible assets    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 26,952 18,612
Accumulated Amortization (17,942) (15,168)
Net Carrying Amount 9,010 3,444
Other intangible assets    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 5,433 5,627
Accumulated Amortization (3,721) (3,041)
Net Carrying Amount $ 1,712 $ 2,586