GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Components of Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 59,761	$ 59,772
Accumulated Amortization	19,423	12,007
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross Amount	48,530	48,530
Accumulated Amortization	16,846	10,911
Customer relationship intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Amount	11,231	11,242
Accumulated Amortization	$ 2,577	$ 1,096