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Note 3 - Investment Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | $ 647,387 | $ 639,532
Unrealized Gains, Available-for-sale | 757 | 3,125
Unrealized Losses, Available-for-sale | (29,213) | (25,414)
Investment securities – available-for-sale, at estimated fair value, net of allowance for credit losses of $0; amortized cost of $647,387 at June 30, 2026 and $639,532 at December 31, 2025 | 618,931 | 617,243
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
US Treasury Securities [Member] |  |
Unrealized Gains, Available-for-sale | 56 | 420
Unrealized Losses, Available-for-sale | (818) | (442)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
US Government Corporations and Agencies Securities [Member] |  |
Unrealized Gains, Available-for-sale | 132 | 462
Unrealized Losses, Available-for-sale | (2,222) | (1,949)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Unrealized Gains, Available-for-sale | 266 | 448
Unrealized Losses, Available-for-sale | (3,113) | (3,241)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Collateralized Mortgage Obligations [Member] |  |
Unrealized Gains, Available-for-sale | 26 | 155
Unrealized Losses, Available-for-sale | (12,568) | (11,235)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Unrealized Gains, Available-for-sale | 277 | 1,640
Unrealized Losses, Available-for-sale | (10,492) | (8,547)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest | 0 | 0
Reported Value Measurement [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 647,387 | 639,532
Reported Value Measurement [Member] | US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 88,411 | 87,578
Reported Value Measurement [Member] | US Government Corporations and Agencies Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 91,691 | 86,831
Reported Value Measurement [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 76,755 | 77,796
Reported Value Measurement [Member] | Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 108,602 | 103,364
Reported Value Measurement [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 281,928 | 283,963
Estimate of Fair Value Measurement [Member] |  |
Investment securities – available-for-sale, at estimated fair value, net of allowance for credit losses of $0; amortized cost of $647,387 at June 30, 2026 and $639,532 at December 31, 2025 | 618,931 | 617,243
Estimate of Fair Value Measurement [Member] | US Treasury Securities [Member] |  |
Investment securities – available-for-sale, at estimated fair value, net of allowance for credit losses of $0; amortized cost of $647,387 at June 30, 2026 and $639,532 at December 31, 2025 | 87,649 | 87,556
Estimate of Fair Value Measurement [Member] | US Government Corporations and Agencies Securities [Member] |  |
Investment securities – available-for-sale, at estimated fair value, net of allowance for credit losses of $0; amortized cost of $647,387 at June 30, 2026 and $639,532 at December 31, 2025 | 89,601 | 85,344
Estimate of Fair Value Measurement [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities – available-for-sale, at estimated fair value, net of allowance for credit losses of $0; amortized cost of $647,387 at June 30, 2026 and $639,532 at December 31, 2025 | 73,908 | 75,003
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Obligations [Member] |  |
Investment securities – available-for-sale, at estimated fair value, net of allowance for credit losses of $0; amortized cost of $647,387 at June 30, 2026 and $639,532 at December 31, 2025 | 96,060 | 92,284
Estimate of Fair Value Measurement [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Investment securities – available-for-sale, at estimated fair value, net of allowance for credit losses of $0; amortized cost of $647,387 at June 30, 2026 and $639,532 at December 31, 2025 | $ 271,713 | $ 277,056

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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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