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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost | $ 880,443 | $ 827,185
Gross unrealized gains | 16 | 10,321
Gross unrealized losses | (96,492) | (6,503)
Estimated fair value | 783,967 | 831,003
US Treasury Securities [Member] |  |
Amortized cost | 230,063 | 192,323
Gross unrealized gains | 0 | 239
Gross unrealized losses | (21,977) | (2,083)
Estimated fair value | 208,086 | 190,479
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 114,018 | 114,531
Gross unrealized gains | 5 | 2,235
Gross unrealized losses | (10,380) | (752)
Estimated fair value | 103,643 | 116,014
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Amortized cost | 138,117 | 149,896
Gross unrealized gains | 6 | 1,375
Gross unrealized losses | (19,766) | (1,670)
Estimated fair value | 118,357 | 149,601
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 316,532 | 290,548
Gross unrealized gains | 5 | 4,035
Gross unrealized losses | (36,048) | (1,724)
Estimated fair value | 280,489 | 292,859
Corporate Debt Securities [Member] |  |
Amortized cost | 81,713 | 79,887
Gross unrealized gains | 0 | 2,437
Gross unrealized losses | (8,321) | (274)
Estimated fair value | $ 73,392 | $ 82,050

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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