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Note 4 - Investment Securities (Details Textual) $ in Thousands | Apr. 01, 2022 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022
--- | --- | --- | ---
Debt Securities, Available-for-Sale, Allowance for Credit Loss |  | $ 0 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 437 | 485
Debt Securities, Available-for-sale, Amortized Cost, Transfer, Amount | $ 245,500 |  |
Debt Securities, Available-for-Sale, Amortized Cost, Net of Gain (Loss), Transfer | 221,700 |  |
Debt Securities, Available-for-Sale, Transfer to Held to Maturity, Gain (Loss) | $ 18,900 |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss |  | $ 0 |
US Government Agencies Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 46 |
US Government Agencies Debt Securities [Member] | Measurement Input, Loss Severity [Member] |  |  |
Debt Securities, Available-for-Sale, Measurement Input |  | 0.1170 |
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 136 |
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Measurement Input, Loss Severity [Member] |  |  |
Debt Securities, Available-for-Sale, Measurement Input |  | 0.1497 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions |  | 255 |
US States and Political Subdivisions Debt Securities [Member] | Measurement Input, Loss Severity [Member] |  |  |
Debt Securities, Available-for-Sale, Measurement Input |  | 0.1404 |
Asset Pledged as Collateral [Member] | Deposits [Member] |  |  |
Financial Instruments, Owned, at Fair Value |  | $ 382,000 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), net of gains (losses) on transfer. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale transferred to investment in debt security measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in earnings from transfer of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) to investment in debt security measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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