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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 | Jun. 30, 2023 | Dec. 31, 2022
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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 | $ 391,212 | $ 390,583
Aggregate unpaid principal balance of loans held for sale | 387,893 | 389,610
Past-due loans of 90 days or more | 2,018 | 0
Nonaccrual loans | 2,018 | 0
Unpaid principal balance of nonaccrual loans | 1,980 | 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 | 260 | 1,495
Aggregate unpaid principal balance of loans held for sale | 240 | 1,350
Past-due loans of 90 days or more | 0 | 0
Nonaccrual loans | $ 0 | $ 0

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