OUTSTANDING COMMITMENTS AND CONTINGENT LIABILITIES - Schedule of Contractual Amount of Exposure to Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Credit Commitments and Contingencies
Total commitments	$ 4,898,745	$ 2,548,178
Commitments to extend credit
Credit Commitments and Contingencies
Total commitments	4,766,360	2,512,714
Standby letters of credit
Credit Commitments and Contingencies
Total commitments	$ 132,385	$ 35,464