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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, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Held-to-maturity |  |  |  |
Debt securities held-to-maturity | $ 336,185 |  |  | $ 68,395
Fair Value | 336,027 |  |  | 72,441
U.S. government agency |  |  |  |
Held-to-maturity |  |  |  |
Debt securities held-to-maturity | 12,349 |  |  |
Fair Value | 12,340 |  |  |
Mortgage-backed: Agency residential |  |  |  |
Held-to-maturity |  |  |  |
Debt securities held-to-maturity | 20,555 |  |  | 13,031
Fair Value | 20,649 |  |  | 13,483
Mortgage-backed: Agency commercial |  |  |  |
Held-to-maturity |  |  |  |
Debt securities held-to-maturity | 287,615 |  |  | 32,880
Fair Value | $ 286,563 |  |  | $ 35,084
Debt Securities Transferred |  |  |  |
Held-to-maturity |  |  |  |
Debt securities held-to-maturity |  | $ 99,271 | $ 135,161 |
Fair Value |  | 99,275 | 129,720 |
Debt Securities Transferred | U.S. government agency |  |  |  |
Held-to-maturity |  |  |  |
Debt securities held-to-maturity |  |  | 7,593 |
Fair Value |  |  | 7,323 |
Debt Securities Transferred | Mortgage-backed: Agency residential |  |  |  |
Held-to-maturity |  |  |  |
Debt securities held-to-maturity |  |  | 8,776 |
Fair Value |  |  | 8,536 |
Debt Securities Transferred | Mortgage-backed: Agency commercial |  |  |  |
Held-to-maturity |  |  |  |
Debt securities held-to-maturity |  | 99,271 | 118,792 |
Fair Value |  | $ 99,275 | $ 113,861 |

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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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 + Details
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