BORROWINGS - Summary of Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Disclosure [Abstract]
Federal funds purchased	$ 199,370	$ 99,226
Securities sold under repurchase agreements	122,226	142,876
Federal Home Loan Bank advances	798,626	822,554
Subordinated debentures and other borrowings	57,632	93,529
Total Borrowings	$ 1,177,854	$ 1,158,185