OUTSTANDING COMMITMENTS AND CONTINGENT LIABILITIES - Schedule of Contractual Amount of Exposure to Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Credit Commitments and Contingencies
Total commitments	$ 4,709,603	$ 4,820,613
Commitments to extend credit
Credit Commitments and Contingencies
Total commitments	4,601,629	4,696,867
Standby letters of credit
Credit Commitments and Contingencies
Total commitments	$ 107,974	$ 123,746