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Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities available-for-sale, amortized costs | $ 682,467 | $ 530,075
Securities available-for-sale, gross unrealized gains | 10,680 | 17,170
Securities available-for-sale, gross unrealized losses | 7,067 | 503
Securities available for sale, at fair value | 686,080 | 546,742
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 279,934 | 86,859
Securities available-for-sale, gross unrealized gains | 2,795 | 4,477
Securities available-for-sale, gross unrealized losses | 4,710 | 173
Securities available for sale, at fair value | 278,019 | 91,163
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 195,365 | 196,435
Securities available-for-sale, gross unrealized gains | 5,314 | 7,778
Securities available-for-sale, gross unrealized losses | 2,007 | 252
Securities available for sale, at fair value | 198,672 | 203,961
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale, amortized costs | 204,164 | 244,780
Securities available-for-sale, gross unrealized gains | 2,323 | 4,473
Securities available-for-sale, gross unrealized losses | 313 | 78
Securities available for sale, at fair value | 206,174 | 249,175
Corporate Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 3,004 | 2,001
Securities available-for-sale, gross unrealized gains | 248 | 442
Securities available-for-sale, gross unrealized losses | 37 |
Securities available for sale, at fair value | $ 3,215 | $ 2,443

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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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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