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FAIR VALUE MEASURES - Difference Between Fair Value and Principal Balance of Loans Held for Sale Measured at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate fair value of SBA loans held for sale | $ 364,332 | $ 281,332
Mortgage loans held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate fair value of mortgage loans held for sale | 363,002 | 281,332
Aggregate unpaid principal balance of loans held for sale | 355,998 | 273,915
Past-due loans of 90 days or more | 463 | 781
Nonaccrual loans | 463 | 781
Unpaid principal balance of nonaccrual loans | 453 | 774
SBA loans held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate fair value of SBA loans held for sale | 1,330 | 0
Aggregate unpaid principal balance of loans held for sale | $ 1,203 | $ 0

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