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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 253,241 | $ 137,572
Temporarily impaired securities, less than 12 months, unrealized losses | 5,263 | 423
Temporarily impaired securities, 12 months or longer, fair value | 31,746 | 48,295
Temporarily impaired securities, 12 months or longer, fair value | 890 | 1,036
Temporarily impaired securities, total fair value | 284,987 | 185,867
Temporarily impaired securities, total unrealized losses | 6,153 | 1,459
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 12,930 | 26,390
Temporarily impaired securities, less than 12 months, unrealized losses | 11 | 102
Temporarily impaired securities, 12 months or longer, fair value | 23,662 | 40,009
Temporarily impaired securities, 12 months or longer, fair value | 280 | 444
Temporarily impaired securities, total fair value | 36,592 | 66,399
Temporarily impaired securities, total unrealized losses | 291 | 546
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
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 190,914 | 1,694
Temporarily impaired securities, less than 12 months, unrealized losses | 4,638 | 23
Temporarily impaired securities, 12 months or longer, fair value | 7,903 | 8,093
Temporarily impaired securities, 12 months or longer, fair value | 601 | 583
Temporarily impaired securities, total fair value | 198,817 | 9,787
Temporarily impaired securities, total unrealized losses | 5,239 | 606
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 9,946 | 10,131
Temporarily impaired securities, less than 12 months, unrealized losses | 65 | 25
Temporarily impaired securities, 12 months or longer, fair value | 181 | 193
Temporarily impaired securities, 12 months or longer, fair value | 9 | 9
Temporarily impaired securities, total fair value | 10,127 | 10,324
Temporarily impaired securities, total unrealized losses | 74 | 34
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 39,451 | 58,405
Temporarily impaired securities, less than 12 months, unrealized losses | 549 | 267
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 | 39,451 | 58,405
Temporarily impaired securities, total unrealized losses | $ 549 | $ 267

X
- 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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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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