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Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available-for-sale, amortized costs | $ 697,786 | $ 759,917
Securities available-for-sale, gross unrealized gains | 0 | 87
Securities available-for-sale, gross unrealized losses | 79,185 | 103,152
Securities available-for-sale, fair values | 618,601 | 656,852
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 353,904 | 391,538
Securities available-for-sale, gross unrealized gains | 0 | 39
Securities available-for-sale, gross unrealized losses | 42,060 | 55,002
Securities available-for-sale, fair values | 311,844 | 336,575
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 179,507 | 190,192
Securities available-for-sale, gross unrealized gains | 0 | 26
Securities available-for-sale, gross unrealized losses | 29,614 | 38,018
Securities available-for-sale, fair values | 149,893 | 152,200
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available-for-sale, amortized costs | 156,875 | 170,694
Securities available-for-sale, gross unrealized gains | 0 | 22
Securities available-for-sale, gross unrealized losses | 6,724 | 9,239
Securities available-for-sale, fair values | 150,151 | 161,477
Corporate Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 6,504 | 6,501
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 754 | 837
Securities available-for-sale, fair values | 5,750 | 5,664
US Treasury Securities [Member] |  |
Securities available-for-sale, amortized costs | 996 | 992
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 33 | 56
Securities available-for-sale, fair values | $ 963 | $ 936

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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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