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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, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021
--- | --- | --- | --- | --- | ---
Held-to-maturity |  |  |  |  |
Debt securities held-to-maturity | $ 541,600 |  | $ 336,185 |  |
Fair Value | 478,801 |  | 336,027 |  |
U.S. government agency |  |  |  |  |
Held-to-maturity |  |  |  |  |
Debt securities held-to-maturity | 88,424 |  | 12,349 |  |
Fair Value | 78,696 |  | 12,340 |  |
Mortgage-backed: Agency residential |  |  |  |  |
Held-to-maturity |  |  |  |  |
Debt securities held-to-maturity | 102,728 |  | 20,555 |  |
Fair Value | 96,258 |  | 20,649 |  |
Mortgage-backed: Agency commercial |  |  |  |  |
Held-to-maturity |  |  |  |  |
Debt securities held-to-maturity | 308,281 |  | 287,615 |  |
Fair Value | $ 261,799 |  | $ 286,563 |  |
Debt Securities Transferred |  |  |  |  |
Held-to-maturity |  |  |  |  |
Debt securities held-to-maturity |  | $ 114,850 |  | $ 99,271 | $ 135,161
Fair Value |  | 104,131 |  | 99,275 | 129,720
Debt Securities Transferred | U.S. government agency |  |  |  |  |
Held-to-maturity |  |  |  |  |
Debt securities held-to-maturity |  | 78,841 |  |  | 7,593
Fair Value |  | 71,048 |  |  | 7,323
Debt Securities Transferred | Mortgage-backed: Agency residential |  |  |  |  |
Held-to-maturity |  |  |  |  |
Debt securities held-to-maturity |  | 8,175 |  |  | 8,776
Fair Value |  | 7,651 |  |  | 8,536
Debt Securities Transferred | Mortgage-backed: Agency commercial |  |  |  |  |
Held-to-maturity |  |  |  |  |
Debt securities held-to-maturity |  | 27,834 |  | 99,271 | 118,792
Fair Value |  | $ 25,432 |  | $ 99,275 | $ 113,861

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