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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 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Held-to-maturity |  |  |
Fair Value | $ 481,925 | $ 478,801 |
U.S. government agency |  |  |
Held-to-maturity |  |  |
Fair Value | 80,173 | 78,696 |
Mortgage-backed: Agency residential |  |  |
Held-to-maturity |  |  |
Fair Value | 95,225 | 96,258 |
Mortgage-backed: Agency commercial |  |  |
Held-to-maturity |  |  |
Fair Value | $ 265,108 | $ 261,799 |
Debt Securities Transferred |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  |  | $ 114,850
Fair Value |  |  | 104,131
Debt Securities Transferred | U.S. government agency |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  |  | 78,841
Fair Value |  |  | 71,048
Debt Securities Transferred | Mortgage-backed: Agency residential |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  |  | 8,175
Fair Value |  |  | 7,651
Debt Securities Transferred | Mortgage-backed: Agency commercial |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  |  | 27,834
Fair Value |  |  | $ 25,432

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