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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 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Available-for-sale: |  |  |
Amortized Cost | $ 521,439 | $ 541,600 | $ 114,850
Debt securities held-to-maturity | 466,496 | 478,801 | 104,131
U.S. government agency |  |  |
Available-for-sale: |  |  |
Amortized Cost | 88,448 | 88,424 | 78,841
Debt securities held-to-maturity | 80,156 | 78,696 | 71,048
Agency residential |  |  |
Available-for-sale: |  |  |
Amortized Cost | 95,828 | 102,728 | 8,175
Debt securities held-to-maturity | 90,259 | 96,258 | 7,651
Agency commercial |  |  |
Available-for-sale: |  |  |
Amortized Cost | 298,721 | 308,281 | 27,834
Debt securities held-to-maturity | $ 257,408 | $ 261,799 | $ 25,432

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