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	Mar. 31, 2026	Dec. 31, 2025
Notional Amount
Included in other assets	$ 1,658,330	$ 1,571,233
Included in other liabilities	1,722,092	1,695,382
Fair Value
Derivative assets	47,497	48,468
Derivative liabilities	46,688	47,980
Interest rate swaps
Notional Amount
Included in other assets	1,555,059	1,529,421
Included in other liabilities	1,656,947	1,668,136
Fair Value
Derivative assets	46,330	47,850
Derivative liabilities	46,289	47,879
Forward contracts related to mortgage loans to be delivered for sale
Notional Amount
Included in other assets	77,409	15,217
Included in other liabilities	24,703	25,000
Fair Value
Derivative assets	919	422
Derivative liabilities	80	99
Interest rate lock commitments
Notional Amount
Included in other assets	25,862	26,595
Included in other liabilities	40,442	2,246
Fair Value
Derivative assets	248	196
Derivative liabilities	$ 319	$ 2