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Note 2 - INVESTMENT SECURITIES - Activity in Allowance for Credit Losses HTM and AFS securities by major security (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 263 | $ 203 |  | $ 263 | $ 203
Reduction due to sales |  |  |  | 0 | 0
Provision | 0 | 0 |  | 0 | 0
Balance, ending | 263 | 203 |  | 263 | 203
Municipal securities |  |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 254 | 202 |  | 254 | 202
Reduction due to sales |  |  |  | 0 | 0
Provision | 0 | 0 |  | 0 | 0
Balance, ending | 254 | 202 |  | 254 | 202
Corporate securities |  |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 8 |  |  | 8 |
Reduction due to sales |  |  |  | 0 |
Provision | 0 |  |  | 0 |
Balance, ending | 8 |  |  | 8 |
Beginning balance |  |  |  |  | 989
Reduction due to sales |  |  |  | 0 | (544)
Provision for credit loss expense | 0 | 0 | $ 989 | 0 | (445)
Other securities |  |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 1 | 1 |  | 1 | 1
Reduction due to sales |  |  |  | 0 | 0
Provision | 0 | 0 |  | 0 | 0
Balance, ending | $ 1 | $ 1 |  | $ 1 | $ 1

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- Definition Amount of decrease in 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) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount excluding accrued interest, 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 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at amortized cost (held-to-maturity) from change in methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-11 + Details
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- Definition Amount excluding accrued interest, of decrease in debt security measured at amortized cost (held-to-maturity) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-11 + Details
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