DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Fair Value of Derivative Financial Instruments and Classification on the Balance Sheet (Details) - Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Notional Amount
Included in other assets	$ 1,544,223	$ 1,440,899
Included in other liabilities	1,619,609	1,514,241
Fair Value
Derivative assets	50,722	77,133
Derivative liabilities	49,863	76,568
Interest rate swaps
Notional Amount
Included in other assets	1,456,442	1,386,757
Included in other liabilities	1,583,830	1,486,764
Fair Value
Derivative assets	49,673	76,528
Derivative liabilities	49,719	76,450
Forward contracts related to mortgage loans to be delivered for sale
Notional Amount
Included in other assets	50,872	39,142
Included in other liabilities	28,559	13,020
Fair Value
Derivative assets	800	465
Derivative liabilities	87	18
Interest rate lock commitments
Notional Amount
Included in other assets	36,909	15,000
Included in other liabilities	7,220	14,457
Fair Value
Derivative assets	249	140
Derivative liabilities	$ 57	$ 100