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Note 4 - Investment Securities - Temporarily Impaired Securities (Details) $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 176,667 | $ 556,415
Temporarily impaired securities, less than 12 months, unrealized losses | $ 630 | $ 3,343
Temporarily impaired securities, less than 12 months, no. Of issuances | 14 | 63
Temporarily impaired securities, 12 months or longer, fair value | $ 899,523 | $ 624,880
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 26,370 | $ 13,341
Temporarily impaired securities, 12 months or longer, no. Of issuances | 90 | 24
Temporarily impaired securities, total fair value | $ 1,076,190 | $ 1,181,295
Temporarily impaired securities, total unrealized losses | $ 27,000 | $ 16,684
Temporarily impaired securities, total no. Of issuances | 104 | 87
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 124,751 | $ 199,823
Temporarily impaired securities, less than 12 months, unrealized losses | $ 51 | $ 62
Temporarily impaired securities, less than 12 months, no. Of issuances | 4 | 4
Temporarily impaired securities, 12 months or longer, fair value |  | $ 49,697
Temporarily impaired securities, 12 months or longer, unrealized losses |  | $ 295
Temporarily impaired securities, 12 months or longer, no. Of issuances |  | 2
Temporarily impaired securities, total fair value | $ 124,751 | $ 249,520
Temporarily impaired securities, total unrealized losses | $ 51 | $ 357
Temporarily impaired securities, total no. Of issuances | 4 | 6
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 3,388 | $ 5,711
Temporarily impaired securities, less than 12 months, unrealized losses | $ 77 | $ 70
Temporarily impaired securities, less than 12 months, no. Of issuances | 2 | 3
Temporarily impaired securities, 12 months or longer, fair value | $ 2,483 |
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 118 |
Temporarily impaired securities, 12 months or longer, no. Of issuances | 2 |
Temporarily impaired securities, total fair value | $ 5,871 | $ 5,711
Temporarily impaired securities, total unrealized losses | $ 195 | $ 70
Temporarily impaired securities, total no. Of issuances | 4 | 3
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, less than 12 months, no. Of issuances |  |
Temporarily impaired securities, 12 months or longer, fair value | $ 388,362 | $ 390,336
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 11,637 | $ 9,664
Temporarily impaired securities, 12 months or longer, no. Of issuances | 8 | 8
Temporarily impaired securities, total fair value | $ 388,362 | $ 390,336
Temporarily impaired securities, total unrealized losses | $ 11,637 | $ 9,664
Temporarily impaired securities, total no. Of issuances | 8 | 8
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 48,528 | $ 342,436
Temporarily impaired securities, less than 12 months, unrealized losses | $ 502 | $ 3,147
Temporarily impaired securities, less than 12 months, no. Of issuances | 8 | 48
Temporarily impaired securities, 12 months or longer, fair value | $ 507,701 | $ 178,617
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 14,587 | $ 3,112
Temporarily impaired securities, 12 months or longer, no. Of issuances | 74 | 13
Temporarily impaired securities, total fair value | $ 556,229 | $ 521,053
Temporarily impaired securities, total unrealized losses | $ 15,089 | $ 6,259
Temporarily impaired securities, total no. Of issuances | 82 | 61
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | $ 1,914
Temporarily impaired securities, less than 12 months, unrealized losses |  | $ 30
Temporarily impaired securities, less than 12 months, no. Of issuances |  | 2
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, no. Of issuances |  |
Temporarily impaired securities, total fair value |  | $ 1,914
Temporarily impaired securities, total unrealized losses |  | $ 30
Temporarily impaired securities, total no. Of issuances |  | 2
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | $ 1,516
Temporarily impaired securities, less than 12 months, unrealized losses |  | $ 17
Temporarily impaired securities, less than 12 months, no. Of issuances |  | 5
Temporarily impaired securities, 12 months or longer, fair value | $ 977 |
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 28 |
Temporarily impaired securities, 12 months or longer, no. Of issuances | 6 |
Temporarily impaired securities, total fair value | $ 977 | $ 1,516
Temporarily impaired securities, total unrealized losses | $ 28 | $ 17
Temporarily impaired securities, total no. Of issuances | 6 | 5
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | $ 5,015
Temporarily impaired securities, less than 12 months, unrealized losses |  | $ 17
Temporarily impaired securities, less than 12 months, no. Of issuances |  | 1
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, no. Of issuances |  |
Temporarily impaired securities, total fair value |  | $ 5,015
Temporarily impaired securities, total unrealized losses |  | $ 17
Temporarily impaired securities, total no. Of issuances |  | 1
Mutual Funds [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  |
Temporarily impaired securities, less than 12 months, unrealized losses |  |
Temporarily impaired securities, less than 12 months, no. Of issuances |  |
Temporarily impaired securities, 12 months or longer, fair value |  | $ 6,230
Temporarily impaired securities, 12 months or longer, unrealized losses |  | $ 270
Temporarily impaired securities, 12 months or longer, no. Of issuances |  | 1
Temporarily impaired securities, total fair value |  | $ 6,230
Temporarily impaired securities, total unrealized losses |  | $ 270
Temporarily impaired securities, total no. Of issuances |  | 1

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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=82897076&loc=d3e27337-111563 + Details
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