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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 | Jun. 30, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Held-to-maturity |  |  |
Debt securities held-to-maturity |  | $ 541,600 |
Fair Value | $ 469,921 | 478,801 |
U.S. government agency |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  | 88,424 |
Fair Value | 78,821 | 78,696 |
Mortgage-backed: Agency residential |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  | 102,728 |
Fair Value | 93,682 | 96,258 |
Mortgage-backed: Agency commercial |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  | 308,281 |
Fair Value | $ 257,937 | $ 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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- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
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