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Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost | $ 708,437 | $ 698,362
Gross unrealized gains | 484 | 1,224
Gross unrealized losses | (96,074) | (82,424)
Securities available-for-sale | 612,847 | 617,162
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 96,165 | 55,898
Gross unrealized gains | 179 | 189
Gross unrealized losses | (11,674) | (10,761)
Securities available-for-sale | 84,670 | 45,326
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 439,445 | 462,004
Gross unrealized gains | 211 | 620
Gross unrealized losses | (60,818) | (51,433)
Securities available-for-sale | 378,838 | 411,191
Commercial Mortgage-Backed Securities [Member] |  |
Amortized cost | 24,989 | 25,240
Gross unrealized gains | 0 | 0
Gross unrealized losses | (4,097) | (3,676)
Securities available-for-sale | 20,892 | 21,564
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 141,775 | 148,795
Gross unrealized gains | 89 | 415
Gross unrealized losses | (19,460) | (16,505)
Securities available-for-sale | 122,404 | 132,705
Corporate Debt Securities [Member] |  |
Amortized cost | 5,000 | 5,000
Gross unrealized gains | 5 | 0
Gross unrealized losses | (18) | (27)
Securities available-for-sale | 4,987 | 4,973
Asset-Backed Securities [Member] |  |
Amortized cost | 892 | 1,260
Gross unrealized gains | 0 | 0
Gross unrealized losses | (7) | (22)
Securities available-for-sale | 885 | 1,238
Other Debt Obligations [Member] |  |
Amortized cost | 171 | 165
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Securities available-for-sale | $ 171 | $ 165

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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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