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Note 2 - INVESTMENT SECURITIES - Summary of the fair value of investment securities pledged (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Aug. 31, 2025 | Dec. 31, 2024 | Aug. 31, 2024
--- | --- | --- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Pledged securities held to maturity, at amortized cost | $ 954,115 |  | $ 835,797 |
Assets pledged as collateral |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 365,165 |  | 188,221 |
Pledged securities held to maturity, at amortized cost | 200,283 | $ 200,300 | 0 | $ 200,300
Assets pledged as collateral | Derivatives |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 178,323 |  | 175,461 |
Assets pledged as collateral | Public deposits |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 3,482 |  | 3,503 |
Assets pledged as collateral | Short-term borrowings |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged |  |  | 9,257 |
Assets pledged as collateral | Other borrowings |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 183,360 |  |  |
Assets pledged as collateral | U.S. govt. sponsored agency securities |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 12,519 |  | 8,396 |
Assets pledged as collateral | U.S. govt. sponsored agency securities | Derivatives |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 11,188 |  | 6,222 |
Assets pledged as collateral | U.S. govt. sponsored agency securities | Public deposits |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 1,331 |  | 1,481 |
Assets pledged as collateral | U.S. govt. sponsored agency securities | Short-term borrowings |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged |  |  | 693 |
Assets pledged as collateral | Residential mortgage-backed and related securities |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 26,229 |  | 28,718 |
Assets pledged as collateral | Residential mortgage-backed and related securities | Derivatives |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 24,078 |  | 18,132 |
Assets pledged as collateral | Residential mortgage-backed and related securities | Public deposits |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 2,151 |  | 2,022 |
Assets pledged as collateral | Residential mortgage-backed and related securities | Short-term borrowings |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged |  |  | 8,564 |
Assets pledged as collateral | Municipal securities |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 326,417 |  | 151,107 |
Assets pledged as collateral | Municipal securities | Derivatives |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | 143,057 |  | $ 151,107 |
Assets pledged as collateral | Municipal securities | Other borrowings |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |
Investment securities pledged | $ 183,360 |  |  |

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- Definition Amount excluding accrued interest, after 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 -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 + Details
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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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