Note 4 - Securities (Details Textual) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | $ 0 | $ 0 | ||
| Debt Securities, Available-for-Sale, Sold at Par Value | $ 70,500 | |||
| Debt Securities, Available-for-Sale, Realized Gain (Loss) | 8,600 | 0 | $ (8,563) | |
| US Treasury Securities and Residential Mortgage-Backed Securities [Member] | ||||
| Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0 | ||
| US States and Political Subdivisions Debt Securities [Member] | ||||
| Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | $ 0 | 0 | $ 0 | |
| Asset Not Pledged as Collateral and Asset Pledged as Collateral without Right [Member] | ||||
| Debt Securities | $ 1,170,000 | $ 1,230,000 | ||
| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with interest rate reset through auction process, sold at par value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- 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). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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