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Note 4 - Investment Securities - Temporarily Impaired Securities (Details) $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 556,415 | $ 1,017,655
Temporarily impaired securities, less than 12 months, unrealized losses | $ 3,343 | $ 13,814
Temporarily impaired securities, less than 12 months, no. Of issuances | 63 | 30
Temporarily impaired securities, 12 months or longer, fair value | $ 624,880 | $ 35,458
orarily impaired securities, 12 months or longer, unrealized losses | $ 13,341 | $ 1,154
Temporarily impaired securities, 12 months or longer, no. Of issuances | 24 | 7
porarily impaired securities, total fair value | $ 1,181,295 | $ 1,053,113
porarily impaired securities, total unrealized losses | $ 16,684 | $ 14,968
Temporarily impaired securities, total no. Of issuances | 87 | 37
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 199,823 | $ 299,088
Temporarily impaired securities, less than 12 months, unrealized losses | $ 62 | $ 857
Temporarily impaired securities, less than 12 months, no. Of issuances | 4 | 6
Temporarily impaired securities, 12 months or longer, fair value | $ 49,697 |
orarily impaired securities, 12 months or longer, unrealized losses | $ 295 |
Temporarily impaired securities, 12 months or longer, no. Of issuances | 2 |
porarily impaired securities, total fair value | $ 249,520 | $ 299,088
porarily impaired securities, total unrealized losses | $ 357 | $ 857
Temporarily impaired securities, total no. Of issuances | 6 | 6
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 5,711 |
Temporarily impaired securities, less than 12 months, unrealized losses | $ 70 |
Temporarily impaired securities, less than 12 months, no. Of issuances | 3 |
Temporarily impaired securities, 12 months or longer, fair value |  |
orarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, no. Of issuances |  |
porarily impaired securities, total fair value | $ 5,711 |
porarily impaired securities, total unrealized losses | $ 70 |
Temporarily impaired securities, total no. Of issuances | 3 |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | $ 390,331
Temporarily impaired securities, less than 12 months, unrealized losses |  | $ 9,669
Temporarily impaired securities, less than 12 months, no. Of issuances |  | 8
Temporarily impaired securities, 12 months or longer, fair value | $ 390,336 |
orarily impaired securities, 12 months or longer, unrealized losses | $ 9,664 |
Temporarily impaired securities, 12 months or longer, no. Of issuances | 8 |
porarily impaired securities, total fair value | $ 390,336 | $ 390,331
porarily impaired securities, total unrealized losses | $ 9,664 | $ 9,669
Temporarily impaired securities, total no. Of issuances | 8 | 8
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 342,436 | $ 328,236
Temporarily impaired securities, less than 12 months, unrealized losses | $ 3,147 | $ 3,288
Temporarily impaired securities, less than 12 months, no. Of issuances | 48 | 16
Temporarily impaired securities, 12 months or longer, fair value | $ 178,617 | $ 62
orarily impaired securities, 12 months or longer, unrealized losses | $ 3,112 | $ 2
Temporarily impaired securities, 12 months or longer, no. Of issuances | 13 | 3
porarily impaired securities, total fair value | $ 521,053 | $ 328,298
porarily impaired securities, total unrealized losses | $ 6,259 | $ 3,290
Temporarily impaired securities, total no. Of issuances | 61 | 19
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 |  |
orarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, 12 months or longer, no. Of issuances |  |
porarily impaired securities, total fair value | $ 1,914 |
porarily 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 |  | $ 28
orarily impaired securities, 12 months or longer, unrealized losses |  | $ 20
Temporarily impaired securities, 12 months or longer, no. Of issuances |  | 1
porarily impaired securities, total fair value | $ 1,516 | $ 28
porarily impaired securities, total unrealized losses | $ 17 | $ 20
Temporarily impaired securities, total no. Of issuances | 5 | 1
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 |  | $ 29,138
orarily impaired securities, 12 months or longer, unrealized losses |  | $ 862
Temporarily impaired securities, 12 months or longer, no. Of issuances |  | 2
porarily impaired securities, total fair value | $ 5,015 | $ 29,138
porarily impaired securities, total unrealized losses | $ 17 | $ 862
Temporarily impaired securities, total no. Of issuances | 1 | 2
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 | $ 6,230
orarily impaired securities, 12 months or longer, unrealized losses | $ 270 | $ 270
Temporarily impaired securities, 12 months or longer, no. Of issuances | 1 | 1
porarily impaired securities, total fair value | $ 6,230 | $ 6,230
porarily impaired securities, total unrealized losses | $ 270 | $ 270
Temporarily impaired securities, total no. Of issuances | 1 | 1

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