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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Securities available-for-sale, amortized cost | $ 773,658 | $ 801,371
Securities available-for-sale, unrealized gains | 226 | 429
Securities available-for-sale, unrealized losses | (81,086) | (79,689)
Securities available-for-sale, fair value | 692,798 | 722,111
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 72,672 | 75,459
Securities available-for-sale, unrealized gains | 108 | 97
Securities available-for-sale, unrealized losses | (2,700) | (2,737)
Securities available-for-sale, fair value | 70,080 | 72,819
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities available-for-sale, amortized cost | 582,582 | 602,261
Securities available-for-sale, unrealized gains | 113 | 322
Securities available-for-sale, unrealized losses | (68,352) | (67,576)
Securities available-for-sale, fair value | 514,343 | 535,007
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized cost | 117,864 | 123,083
Securities available-for-sale, unrealized gains | 5 | 10
Securities available-for-sale, unrealized losses | (9,996) | (9,339)
Securities available-for-sale, fair value | 107,873 | 113,754
Other Debt Obligations [Member] |  |
Securities available-for-sale, amortized cost | 540 | 568
Securities available-for-sale, unrealized gains | 0 | 0
Securities available-for-sale, unrealized losses | (38) | (37)
Securities available-for-sale, fair value | $ 502 | $ 531

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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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