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Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost | $ 709,388 | $ 721,799
Gross unrealized gains | 578 | 289
Gross unrealized losses | (80,965) | (87,204)
Securities available-for-sale | 629,001 | 634,884
Allowance for investment credit losses | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 53,301 | 54,889
Gross unrealized gains | 1 | 0
Gross unrealized losses | (9,787) | (10,439)
Securities available-for-sale | 43,515 | 44,450
Allowance for investment credit losses | 0 | 0
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 469,925 | 475,263
Gross unrealized gains | 322 | 178
Gross unrealized losses | (50,580) | (57,863)
Securities available-for-sale | 419,667 | 417,578
Allowance for investment credit losses | 0 | 0
Commercial Mortgage-Backed Securities [Member] |  |
Amortized cost | 25,424 | 25,485
Gross unrealized gains | 0 | 0
Gross unrealized losses | (3,464) | (4,381)
Securities available-for-sale | 21,960 | 21,104
Allowance for investment credit losses | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 155,101 | 157,247
Gross unrealized gains | 255 | 111
Gross unrealized losses | (17,060) | (14,462)
Securities available-for-sale | 138,296 | 142,896
Allowance for investment credit losses | 0 | 0
Corporate Debt Securities [Member] |  |
Amortized cost | 4,000 | 7,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | (23) | (26)
Securities available-for-sale | 3,977 | 6,974
Allowance for investment credit losses | 0 | 0
Asset-Backed Securities [Member] |  |
Amortized cost | 1,505 | 1,673
Gross unrealized gains | 0 | 0
Gross unrealized losses | (51) | (33)
Securities available-for-sale | 1,454 | 1,640
Allowance for investment credit losses | 0 | 0
Other Debt Obligations [Member] |  |
Amortized cost | 132 | 242
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Securities available-for-sale | 132 | 242
Allowance for investment credit losses | $ 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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