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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 | Sep. 30, 2025 | Dec. 31, 2024
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Mortgage loans Held for Sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate fair value of loans held for sale | $ 599,399 | $ 528,599
Aggregate unpaid principal balance of loans held for sale | 585,799 | 525,071
Past-due loans of 90 days or more | 667 | 0
Nonaccrual loans | 667 | 0
Unpaid principal balance of nonaccrual loans | 647 | 0
SBA Loans Held for Sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate fair value of loans held for sale | 4,737 | 0
Aggregate unpaid principal balance of loans held for sale | $ 4,408 | $ 0

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