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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 142,983 | $ 176,667
Temporarily impaired securities, less than 12 months, unrealized losses | 262 | 630
Temporarily impaired securities, 12 months or longer, fair value | 910,288 | 899,523
Temporarily impaired securities, 12 months or longer, unrealized losses | 15,089 | 26,370
Temporarily impaired securities, total fair value | 1,053,271 | 1,076,190
Temporarily impaired securities, total unrealized losses | 15,351 | 27,000
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 99,779 | 124,751
Temporarily impaired securities, less than 12 months, unrealized losses | 11 | 51
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, total fair value | 99,779 | 124,751
Temporarily impaired securities, total unrealized losses | 11 | 51
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | 3,388
Temporarily impaired securities, less than 12 months, unrealized losses |  | 77
Temporarily impaired securities, 12 months or longer, fair value | 4,577 | 2,483
Temporarily impaired securities, 12 months or longer, unrealized losses | 166 | 118
Temporarily impaired securities, total fair value | 4,577 | 5,871
Temporarily impaired securities, total unrealized losses | 166 | 195
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  |
Temporarily impaired securities, less than 12 months, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, fair value | 393,274 | 388,362
Temporarily impaired securities, 12 months or longer, unrealized losses | 6,726 | 11,637
Temporarily impaired securities, total fair value | 393,274 | 388,362
Temporarily impaired securities, total unrealized losses | 6,726 | 11,637
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 3,437 | 48,528
Temporarily impaired securities, less than 12 months, unrealized losses | 18 | 502
Temporarily impaired securities, 12 months or longer, fair value | 511,556 | 507,701
Temporarily impaired securities, 12 months or longer, unrealized losses | 8,173 | 14,587
Temporarily impaired securities, total fair value | 514,993 | 556,229
Temporarily impaired securities, total unrealized losses | 8,191 | 15,089
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  |
Temporarily impaired securities, less than 12 months, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, fair value | 881 | 977
Temporarily impaired securities, 12 months or longer, unrealized losses | 24 | 28
Temporarily impaired securities, total fair value | 881 | 977
Temporarily impaired securities, total unrealized losses | 24 | $ 28
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 39,767 |
Temporarily impaired securities, less than 12 months, unrealized losses | 233 |
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, total fair value | 39,767 |
Temporarily impaired securities, total unrealized losses | $ 233 |

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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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