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Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | ---
Amortized cost | $ 1,309,724 |  | $ 708,437
Gross unrealized gains | 4,975 |  | 484
Gross unrealized losses | (87,499) |  | (96,074)
Obligations of U.S. states and political subdivisions | 1,227,200 |  | 612,847
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | $ 0 | 0
US Government Agencies Debt Securities [Member] |  |  |
Amortized cost | 368,785 |  | 96,165
Gross unrealized gains | 1,281 |  | 179
Gross unrealized losses | (10,649) |  | (11,674)
Obligations of U.S. states and political subdivisions | 359,417 |  | 84,670
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0
Residential Mortgage-Backed Securities [Member] |  |  |
Amortized cost | 677,879 |  | 439,445
Gross unrealized gains | 2,612 |  | 211
Gross unrealized losses | (52,352) |  | (60,818)
Obligations of U.S. states and political subdivisions | 628,139 |  | 378,838
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0
Commercial Mortgage-Backed Securities [Member] |  |  |
Amortized cost | 30,266 |  | 24,989
Gross unrealized gains | 36 |  | 0
Gross unrealized losses | (3,730) |  | (4,097)
Obligations of U.S. states and political subdivisions | 26,572 |  | 20,892
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost | 226,834 |  | 141,775
Gross unrealized gains | 1,044 |  | 89
Gross unrealized losses | (20,752) |  | (19,460)
Obligations of U.S. states and political subdivisions | 207,126 |  | 122,404
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0
Corporate Debt Securities [Member] |  |  |
Amortized cost | 5,000 |  | 5,000
Gross unrealized gains | 1 |  | 5
Gross unrealized losses | (6) |  | (18)
Obligations of U.S. states and political subdivisions | 4,995 |  | 4,987
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0
Asset-Backed Securities [Member] |  |  |
Amortized cost | 832 |  | 892
Gross unrealized gains | 1 |  | 0
Gross unrealized losses | (10) |  | (7)
Obligations of U.S. states and political subdivisions | 823 |  | 885
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0
Other Debt Obligations [Member] |  |  |
Amortized cost | 128 |  | 171
Gross unrealized gains | 0 |  | 0
Gross unrealized losses | 0 |  | 0
Obligations of U.S. states and political subdivisions | 128 |  | 171
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | $ 0 |  | $ 0

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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 (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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 (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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