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Note 3 - Investment Securities - Temporarily Impaired Securities (Details) $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 144,339 | $ 176,667
Temporarily impaired securities, less than 12 months, unrealized losses | $ 231 | $ 630
Temporarily impaired securities, less than 12 months, no. Of issuances | 349,366 | 899,523
Temporarily impaired securities, 12 months or longer, fair value | $ 1,509 | $ 26,370
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 493,705 | $ 1,076,190
Temporarily impaired securities, 12 months or longer, no. Of issuances | 1,740 | 27,000
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 48,829 | $ 3,388
Temporarily impaired securities, less than 12 months, unrealized losses | $ 172 | $ 77
Temporarily impaired securities, less than 12 months, no. Of issuances | 3,570 | 2,483
Temporarily impaired securities, 12 months or longer, fair value | $ 147 | $ 118
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 52,399 | $ 5,871
Temporarily impaired securities, 12 months or longer, no. Of issuances | 319 | 195
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | $ 124,751
Temporarily impaired securities, less than 12 months, unrealized losses |  | $ 51
Temporarily impaired securities, less than 12 months, no. Of issuances |  | 0
Temporarily impaired securities, 12 months or longer, fair value |  | $ 0
Temporarily impaired securities, 12 months or longer, unrealized losses |  | $ 124,751
Temporarily impaired securities, 12 months or longer, no. Of issuances |  | 51
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 0 | $ 0
Temporarily impaired securities, less than 12 months, unrealized losses | $ 0 | $ 0
Temporarily impaired securities, less than 12 months, no. Of issuances | 224,443 | 388,362
Temporarily impaired securities, 12 months or longer, fair value | $ 557 | $ 11,637
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 224,443 | $ 388,362
Temporarily impaired securities, 12 months or longer, no. Of issuances | 557 | 11,637
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 43,719 | $ 48,528
Temporarily impaired securities, less than 12 months, unrealized losses | $ 36 | $ 502
Temporarily impaired securities, less than 12 months, no. Of issuances | 120,801 | 507,701
Temporarily impaired securities, 12 months or longer, fair value | $ 788 | $ 14,587
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 164,520 | $ 556,229
Temporarily impaired securities, 12 months or longer, no. Of issuances | 824 | 15,089
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 0 | $ 0
Temporarily impaired securities, less than 12 months, unrealized losses | $ 0 | $ 0
Temporarily impaired securities, less than 12 months, no. Of issuances | 552 | 977
Temporarily impaired securities, 12 months or longer, fair value | $ 17 | $ 28
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 552 | $ 977
Temporarily impaired securities, 12 months or longer, no. Of issuances | 17 | 28
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 51,791 |
Temporarily impaired securities, less than 12 months, unrealized losses | 23 |
Temporarily impaired securities, 12 months or longer, fair value | 0 |
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 51,791 |
Temporarily impaired securities, 12 months or longer, no. Of issuances | 23 |

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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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 less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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X
- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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