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SEGMENT INFORMATION - Reconciliation of the Reportable Segment Financial Information (Details) - Segment Reconciling Items [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Average assets: |  |  |  |
Total average interest-earning assets for segments | $ 18,239,229 | $ 18,036,587 | $ 18,274,913 | $ 18,029,907
Average non-interest-earning assets | 789,563 | 846,787 | 783,834 | 845,490
Total consolidated average assets | $ 19,028,792 | $ 18,883,374 | $ 19,058,747 | $ 18,875,397

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