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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income on nonaccrual loans | $ 0 | $ 0 |
Loans, net of unearned income | 20,600,260 |  | $ 20,269,303
Unfunded commitments | 4,053 | $ 843 |
Unfunded Loan Commitments |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unfunded commitments | 446 |  | 1,500
9 |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income | 0 |  | 0
Loan Receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable | $ 77,400 |  | $ 79,200

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