SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details)	Dec. 31, 2025
Deposit premiums
Finite-Lived Intangible Assets [Line Items]
Estimated life (in years)	10 years
Minimum | Other client relationship intangibles
Finite-Lived Intangible Assets [Line Items]
Estimated life (in years)	7 years
Maximum | Other client relationship intangibles
Finite-Lived Intangible Assets [Line Items]
Estimated life (in years)	15 years