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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available-for-sale, amortized costs | $ 738,559 | $ 682,467
Securities available-for-sale, gross unrealized gains | 1,390 | 10,680
Securities available-for-sale, gross unrealized losses | 40,595 | 7,067
Securities available for sale, at fair value | 699,354 | 686,080
US Treasury Securities [Member] |  |
Securities available-for-sale, amortized costs | 989 |
Securities available-for-sale, gross unrealized gains | 0 |
Securities available-for-sale, gross unrealized losses | 25 |
Securities available for sale, at fair value | 964 |
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 344,348 | 279,934
Securities available-for-sale, gross unrealized gains | 904 | 2,795
Securities available-for-sale, gross unrealized losses | 22,864 | 4,710
Securities available for sale, at fair value | 322,388 | 278,019
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 193,185 | 195,365
Securities available-for-sale, gross unrealized gains | 416 | 5,314
Securities available-for-sale, gross unrealized losses | 14,801 | 2,007
Securities available for sale, at fair value | 178,800 | 198,672
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available-for-sale, amortized costs | 193,538 | 204,164
Securities available-for-sale, gross unrealized gains | 70 | 2,323
Securities available-for-sale, gross unrealized losses | 2,722 | 313
Securities available for sale, at fair value | 190,886 | 206,174
Corporate Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 6,499 | 3,004
Securities available-for-sale, gross unrealized gains | 0 | 248
Securities available-for-sale, gross unrealized losses | 183 | 37
Securities available for sale, at fair value | $ 6,316 | $ 3,215

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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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