DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) - Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Other Assets
Notional Amount
Included in other assets	$ 1,455,473	$ 1,440,899
Fair Value
Derivative assets	63,734	77,133
Other Liabilities
Notional Amount
Included in other liabilities	1,542,417	1,514,241
Fair Value
Derivative liabilities	62,944	76,568
Interest rate swaps | Other Assets
Notional Amount
Included in other assets	1,381,111	1,386,757
Fair Value
Derivative assets	62,871	76,528
Interest rate swaps | Other Liabilities
Notional Amount
Included in other liabilities	1,489,483	1,486,764
Fair Value
Derivative liabilities	62,785	76,450
Forward contracts related to mortgage loans to be delivered for sale | Other Assets
Notional Amount
Included in other assets	38,472	39,142
Fair Value
Derivative assets	576	465
Forward contracts related to mortgage loans to be delivered for sale | Other Liabilities
Notional Amount
Included in other liabilities	37,000	13,020
Fair Value
Derivative liabilities	113	18
Interest rate lock commitments | Other Assets
Notional Amount
Included in other assets	35,890	15,000
Fair Value
Derivative assets	287	140
Interest rate lock commitments | Other Liabilities
Notional Amount
Included in other liabilities	15,934	14,457
Fair Value
Derivative liabilities	$ 46	$ 100