DERIVATIVES - (Derivative position) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2020
Derivatives designated as hedges | Interest rate swaps and caps related to customer deposits and borrowings
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount, derivative asset		$ 300,000
Derivatives unrecognized, termination value	$ 12,700
Derivatives designated as hedges | Interest rate swaps related to customer deposits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount, derivative asset	700,000
Fair Value, Other Assets	6,505
Derivatives not designated as hedges | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount, derivative asset	69,000
Fair Value, Other Assets	55
Fair Value, Other Liabilities	$ 55