GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Components of Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 59,761	$ 59,761
Accumulated Amortization	24,010	21,771
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross Amount	48,530	48,530
Accumulated Amortization	20,503	18,706
Customer relationship intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Amount	11,231	11,231
Accumulated Amortization	$ 3,507	$ 3,065