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SECURITIES - Amortized cost and Fair values of held-to-maturity securities transferred from available-for-sale securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Available-for-sale: |  |  |
Amortized Cost | $ 527,144 | $ 541,600 |
Debt securities held-to-maturity | 450,313 | 478,801 |
U.S. government agency |  |  |
Available-for-sale: |  |  |
Amortized Cost | 88,442 | 88,424 |
Debt securities held-to-maturity | 76,050 | 78,696 |
Agency residential |  |  |
Available-for-sale: |  |  |
Amortized Cost | 98,115 | 102,728 |
Debt securities held-to-maturity | 88,834 | 96,258 |
Agency commercial |  |  |
Available-for-sale: |  |  |
Amortized Cost | 301,243 | 308,281 |
Debt securities held-to-maturity | $ 247,765 | $ 261,799 |
Debt Securities Transferred |  |  |
Available-for-sale: |  |  |
Amortized Cost |  |  | $ 114,850
Debt securities held-to-maturity |  |  | 104,131
Debt Securities Transferred | U.S. government agency |  |  |
Available-for-sale: |  |  |
Amortized Cost |  |  | 78,841
Debt securities held-to-maturity |  |  | 71,048
Debt Securities Transferred | Agency residential |  |  |
Available-for-sale: |  |  |
Amortized Cost |  |  | 8,175
Debt securities held-to-maturity |  |  | 7,651
Debt Securities Transferred | Agency commercial |  |  |
Available-for-sale: |  |  |
Amortized Cost |  |  | 27,834
Debt securities held-to-maturity |  |  | $ 25,432

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