DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)	3 Months Ended
	Mar. 31, 2026 USD ($) broker swap risk_participation_Agreement customer	Mar. 31, 2025 USD ($) risk_participation_Agreement	Dec. 31, 2025 USD ($) risk_participation_Agreement broker swap customer
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Swap fee income	$ 1,339,000	$ 394,000
Number of termination swaps | swap	3
Number of matured swap agreement | swap	2
Cash collateral held by counterparty for derivatives	$ 10,700,000		$ 8,000,000.0
Cash collateral held from counterparties	$ 1,900,000		0
Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of new interest rate swaps | swap	0
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of new interest rate swaps | swap	16
Swap fee income	$ 1,300,000
Interest rate swaps | Commercial Loan
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of new interest rate swaps | swap	9
Swap fee income		$ 394,000
Interest rate swaps | Derivatives not designated as hedging instruments: | Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liabilities	$ 585,979,000		539,225,000
Interest rate swaps | Derivatives not designated as hedging instruments: | Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative asset	$ 585,979,000		$ 539,225,000
Interest rate swaps | Cash Flow Hedging | Derivatives designated as hedging instruments:
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivatives | swap	2		2
Derivative, notional amount	$ 160,000,000.0		$ 160,000,000.0
Interest rate swap-fixed pay
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 100,000,000.0
Derivative instrument, number of derivatives terminated | swap	3
Interest rate products | Derivatives not designated as hedging instruments:
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 1,200,000,000		$ 1,100,000,000
Number of customers | customer	107		96
Third-party broker | broker	107		96
Risk participations - sold credit protection | Derivatives not designated as hedging instruments:
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of risk participation agreements, matured | risk_participation_Agreement	1	(1)
Risk participations - sold credit protection | Derivatives not designated as hedging instruments: | Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Risk participation agreements with sold protection | risk_participation_Agreement	5		6
Derivative liabilities	$ 26,100,000		$ 44,600,000
Risk participations - purchased credit protection | Derivatives not designated as hedging instruments: | Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Risk participation agreements with purchase protection | risk_participation_Agreement	6		6
Derivative asset	$ 31,600,000		$ 31,700,000
Risk participation agreements | Derivatives not designated as hedging instruments:
Derivative Instruments and Hedging Activities Disclosures [Line Items]
New risk participation agreements | risk_participation_Agreement	0	0
Number of risk participation agreements terminated | risk_participation_Agreement	0