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Note 3 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 137,572 | $ 144,339
Temporarily impaired securities, less than 12 months, unrealized losses | 423 | 231
Temporarily impaired securities, 12 months or longer, fair value | 48,295 | 349,366
Temporarily impaired securities, 12 months or longer, fair value | 1,036 | 1,509
Temporarily impaired securities, total fair value | 185,867 | 493,705
Temporarily impaired securities, total unrealized losses | 1,459 | 1,740
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 40,952 |
Temporarily impaired securities, less than 12 months, unrealized losses | 6 |
Temporarily impaired securities, 12 months or longer, fair value | 0 |
Temporarily impaired securities, 12 months or longer, fair value | 0 |
Temporarily impaired securities, total fair value | 40,952 |
Temporarily impaired securities, total unrealized losses | 6 |
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 26,390 | 48,829
Temporarily impaired securities, less than 12 months, unrealized losses | 102 | 172
Temporarily impaired securities, 12 months or longer, fair value | 40,009 | 3,570
Temporarily impaired securities, 12 months or longer, fair value | 444 | 147
Temporarily impaired securities, total fair value | 66,399 | 52,399
Temporarily impaired securities, total unrealized losses | 546 | 319
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | 0
Temporarily impaired securities, less than 12 months, unrealized losses |  | 0
Temporarily impaired securities, 12 months or longer, fair value |  | 224,443
Temporarily impaired securities, 12 months or longer, fair value |  | 557
Temporarily impaired securities, total fair value |  | 224,443
Temporarily impaired securities, total unrealized losses |  | 557
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 1,694 | 43,719
Temporarily impaired securities, less than 12 months, unrealized losses | 23 | 36
Temporarily impaired securities, 12 months or longer, fair value | 8,093 | 120,801
Temporarily impaired securities, 12 months or longer, fair value | 583 | 788
Temporarily impaired securities, total fair value | 9,787 | 164,520
Temporarily impaired securities, total unrealized losses | 606 | 824
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 10,131 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 25 | 0
Temporarily impaired securities, 12 months or longer, fair value | 193 | 552
Temporarily impaired securities, 12 months or longer, fair value | 9 | 17
Temporarily impaired securities, total fair value | 10,324 | 552
Temporarily impaired securities, total unrealized losses | 34 | 17
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 58,405 | 51,791
Temporarily impaired securities, less than 12 months, unrealized losses | 267 | 23
Temporarily impaired securities, 12 months or longer, fair value | 0 | 0
Temporarily impaired securities, 12 months or longer, fair value | 0 | 0
Temporarily impaired securities, total fair value | 58,405 | 51,791
Temporarily impaired securities, total unrealized losses | $ 267 | $ 23

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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