DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value
Assets Derivatives	$ 89,743	$ 79,379
Liabilities Derivatives	89,437	79,008
Other Assets | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other assets	1,404,105	1,393,813
Fair Value
Assets Derivatives	89,743	79,379
Other Liabilities | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other liabilities	1,396,231	1,382,262
Fair Value
Liabilities Derivatives	89,437	79,008
Interest rate swaps | Other Assets | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other assets	1,348,270	1,355,947
Fair Value
Assets Derivatives	89,209	78,743
Interest rate swaps | Other Liabilities | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other liabilities	1,348,270	1,355,947
Fair Value
Liabilities Derivatives	89,265	78,811
Forward contracts related to mortgage loans to be delivered for sale | Other Assets | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other assets	25,689	15,160
Fair Value
Assets Derivatives	357	469
Forward contracts related to mortgage loans to be delivered for sale | Other Liabilities | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other liabilities	32,935	25,290
Fair Value
Liabilities Derivatives	143	191
Interest rate lock commitments | Other Assets | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other assets	30,146	22,706
Fair Value
Assets Derivatives	177	167
Interest rate lock commitments | Other Liabilities | Derivatives Not Designated as Hedging Instruments
Notional Amount
Included in other liabilities	15,026	1,025
Fair Value
Liabilities Derivatives	$ 29	$ 6