DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value
Assets Derivatives	$ 62,270	$ 79,379
Liabilities Derivatives	61,386	79,008
Derivatives Not Designated as Hedging Instruments | Other Assets
Notional Amount
Included in other assets	1,452,549	1,393,813
Fair Value
Assets Derivatives	62,270	79,379
Derivatives Not Designated as Hedging Instruments | Other Liabilities
Notional Amount
Included in other liabilities	1,377,045	1,382,262
Fair Value
Liabilities Derivatives	61,386	79,008
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other Assets
Notional Amount
Included in other assets	1,333,382	1,355,947
Fair Value
Assets Derivatives	61,207	78,743
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other Liabilities
Notional Amount
Included in other liabilities	1,332,410	1,355,947
Fair Value
Liabilities Derivatives	61,248	78,811
Derivatives Not Designated as Hedging Instruments | Forward contracts related to mortgage loans to be delivered for sale | Other Assets
Notional Amount
Included in other assets	80,528	15,160
Fair Value
Assets Derivatives	840	469
Derivatives Not Designated as Hedging Instruments | Forward contracts related to mortgage loans to be delivered for sale | Other Liabilities
Notional Amount
Included in other liabilities	16,500	25,290
Fair Value
Liabilities Derivatives	61	191
Derivatives Not Designated as Hedging Instruments | Interest rate lock commitments | Other Assets
Notional Amount
Included in other assets	38,639	22,706
Fair Value
Assets Derivatives	223	167
Derivatives Not Designated as Hedging Instruments | Interest rate lock commitments | Other Liabilities
Notional Amount
Included in other liabilities	28,135	1,025
Fair Value
Liabilities Derivatives	$ 77	$ 6