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GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Goodwill And Intangible Assets [Line Items]    
Goodwill $ 355,296 $ 355,296
Intangible assets, excluding capitalized software    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 139,685 139,645
Accumulated Amortization (96,760) (91,757)
Net Carrying Amount 42,925 47,888
Core deposit intangibles    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 43,578 43,578
Accumulated Amortization (42,367) (41,836)
Net Carrying Amount 1,211 1,742
Customer relationship intangibles    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 65,494 65,494
Accumulated Amortization (32,170) (28,776)
Net Carrying Amount 33,324 36,718
Software intangible assets    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 26,932 26,932
Accumulated Amortization (19,503) (18,461)
Net Carrying Amount 7,429 8,471
Other intangible assets    
Goodwill And Intangible Assets [Line Items]    
Gross Carrying Amount 3,681 3,641
Accumulated Amortization (2,720) (2,684)
Net Carrying Amount $ 961 $ 957