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Note 4 - Investment Securities - Held to Maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities held-to-maturity, carrying value | $ 473,217 | $ 0
Securities held-to-maturity, gains | 0 |
Securities held-to-maturity, losses | (41,384) |
Debt Securities, Held-to-Maturity, Fair Value, Total | 431,833 | $ 0
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities held-to-maturity, carrying value | 217,794 |
Securities held-to-maturity, gains | 0 |
Securities held-to-maturity, losses | (9,166) |
Debt Securities, Held-to-Maturity, Fair Value, Total | 208,628 |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities held-to-maturity, carrying value | 27,507 |
Securities held-to-maturity, gains | 0 |
Securities held-to-maturity, losses | (2,559) |
Debt Securities, Held-to-Maturity, Fair Value, Total | 24,948 |
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities held-to-maturity, carrying value | 227,916 |
Securities held-to-maturity, gains | 0 |
Securities held-to-maturity, losses | (29,659) |
Debt Securities, Held-to-Maturity, Fair Value, Total | $ 198,257 |

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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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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 + Details
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