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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost | $ 824,767 | $ 869,996
Gross unrealized gains | 11 | 42
Gross unrealized losses | (87,834) | (83,600)
Estimated fair value | 736,944 | 786,438
US Treasury Securities [Member] |  |
Amortized cost | 221,032 | 227,065
Gross unrealized gains | 0 | 0
Gross unrealized losses | (18,510) | (19,468)
Estimated fair value | 202,522 | 207,597
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 107,597 | 110,370
Gross unrealized gains | 2 | 4
Gross unrealized losses | (9,550) | (9,441)
Estimated fair value | 98,049 | 100,933
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Amortized cost | 119,999 | 133,205
Gross unrealized gains | 3 | 4
Gross unrealized losses | (18,450) | (16,468)
Estimated fair value | 101,552 | 116,741
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 298,962 | 317,179
Gross unrealized gains | 6 | 27
Gross unrealized losses | (33,669) | (31,203)
Estimated fair value | 265,299 | 286,003
Corporate Debt Securities [Member] |  |
Amortized cost | 77,177 | 82,177
Gross unrealized gains | 0 | 7
Gross unrealized losses | (7,655) | (7,020)
Estimated fair value | $ 69,522 | $ 75,164

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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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