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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 358,495 | $ 137,572
Temporarily impaired securities, less than 12 months, unrealized losses | 3,775 | 423
Temporarily impaired securities, 12 months or longer, fair value | 19,973 | 48,295
Temporarily impaired securities, 12 months or longer, fair value | 1,071 | 1,036
Temporarily impaired securities, total fair value | 378,468 | 185,867
Temporarily impaired securities, total unrealized losses | 4,846 | 1,459
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 26,390
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 102
Temporarily impaired securities, 12 months or longer, fair value | 2,475 | 40,009
Temporarily impaired securities, 12 months or longer, fair value | 137 | 444
Temporarily impaired securities, total fair value | 2,475 | 66,399
Temporarily impaired securities, total unrealized losses | 137 | 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 | 298,310 | 1,694
Temporarily impaired securities, less than 12 months, unrealized losses | 3,159 | 23
Temporarily impaired securities, 12 months or longer, fair value | 7,583 | 8,093
Temporarily impaired securities, 12 months or longer, fair value | 677 | 583
Temporarily impaired securities, total fair value | 305,893 | 9,787
Temporarily impaired securities, total unrealized losses | 3,836 | 606
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 9,574 | 10,131
Temporarily impaired securities, less than 12 months, unrealized losses | 264 | 25
Temporarily impaired securities, 12 months or longer, fair value | 162 | 193
Temporarily impaired securities, 12 months or longer, fair value | 10 | 9
Temporarily impaired securities, total fair value | 9,736 | 10,324
Temporarily impaired securities, total unrealized losses | 274 | 34
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 50,611 | 58,405
Temporarily impaired securities, less than 12 months, unrealized losses | 352 | 267
Temporarily impaired securities, 12 months or longer, fair value | 9,753 | 0
Temporarily impaired securities, 12 months or longer, fair value | 247 | 0
Temporarily impaired securities, total fair value | 60,364 | 58,405
Temporarily impaired securities, total unrealized losses | $ 599 | $ 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=123581744&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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