DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) instrument institution	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) instrument institution	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) instrument
Derivative [Line Items]
Interest rate cash flow hedge expense reclassified to interest income (prior year less than)	$ 3,100	$ 1,300	$ 7,200	$ 3,100
Number of variable-rate to fixed-rate swap transactions | instrument	130		130		154
Derivative, net liability position, aggregate fair value	$ 4,400		$ 4,400		$ 0
Post Collateral on derivative	$ 4,900		$ 4,900		0
Minimum
Derivative [Line Items]
Remaining maturity period	1 year		1 year
Maximum
Derivative [Line Items]
Remaining maturity period	10 years		10 years
Derivatives in Cash Flow Hedging Relationships
Derivative [Line Items]
Notional	$ 2,000,000		$ 2,000,000		$ 1,500,000
Interest rate swaps and options | Derivatives in Cash Flow Hedging Relationships
Derivative [Line Items]
Count | instrument	23		23		18
Purchase of derivatives			$ 40,400
Notional	$ 2,000,000		$ 2,000,000		$ 1,500,000
Swap Guarantee
Derivative [Line Items]
Number of financial institutions | institution	1		1
Aggregate fair value of swaps to customers	$ 4,400		$ 4,400		5,500
Interest rate swap
Derivative [Line Items]
Notional	$ 500,000		$ 500,000		$ 600,000
Number of variable-rate to fixed-rate swap transactions | instrument	0		0		0
Cash
Derivative [Line Items]
Collateral value against obligations	$ 6,400		$ 6,400