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Note 4 - Investment Securities - Temporarily Impaired Securities (Details) $ in Thousands | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 1,017,655 | $ 1,410,387
Temporarily impaired securities, less than 12 months, unrealized losses | $ 13,814 | $ 14,253
Temporarily impaired securities, less than 12 months, no. Of issuances | 30 | 47
Temporarily impaired securities, 12 months or longer, fair value | $ 35,458 | $ 49,400
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 1,154 | $ 1,670
Temporarily impaired securities, 12 months or longer, no. Of issuances | 7 | 7
Temporarily impaired securities, total fair value | $ 1,053,113 | $ 1,459,787
Temporarily impaired securities, total unrealized losses | $ 14,968 | $ 15,923
Temporarily impaired securities, total no. Of issuances | 37 | 54
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 299,088 | $ 224,289
Temporarily impaired securities, less than 12 months, unrealized losses | $ 857 | $ 395
Temporarily impaired securities, less than 12 months, no. Of issuances | 6 | 5
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 | $ 299,088 | $ 224,289
Temporarily impaired securities, total unrealized losses | $ 857 | $ 395
Temporarily impaired securities, total no. Of issuances | 6 | 5
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 390,331 | $ 148,160
Temporarily impaired securities, less than 12 months, unrealized losses | $ 9,669 | $ 1,840
Temporarily impaired securities, less than 12 months, no. Of issuances | 8 | 3
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 | $ 390,331 | $ 148,160
Temporarily impaired securities, total unrealized losses | $ 9,669 | $ 1,840
Temporarily impaired securities, total no. Of issuances | 8 | 3
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | $ 328,236 | $ 1,025,342
Temporarily impaired securities, less than 12 months, unrealized losses | $ 3,288 | $ 11,398
Temporarily impaired securities, less than 12 months, no. Of issuances | 16 | 35
Temporarily impaired securities, 12 months or longer, fair value | $ 62 | $ 6
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 2 | $ 1
Temporarily impaired securities, 12 months or longer, no. Of issuances | 3 | 2
Temporarily impaired securities, total fair value | $ 328,298 | $ 1,025,348
Temporarily impaired securities, total unrealized losses | $ 3,290 | $ 11,399
Temporarily impaired securities, total no. Of issuances | 19 | 37
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, less than 12 months, no. Of issuances |  |
Temporarily impaired securities, 12 months or longer, fair value | $ 28 | $ 36
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 20 | $ 27
Temporarily impaired securities, 12 months or longer, no. Of issuances | 1 | 1
Temporarily impaired securities, total fair value | $ 28 | $ 36
Temporarily impaired securities, total unrealized losses | $ 20 | $ 27
Temporarily impaired securities, total no. Of issuances | 1 | 1
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | $ 9,950
Temporarily impaired securities, less than 12 months, unrealized losses |  | $ 50
Temporarily impaired securities, less than 12 months, no. Of issuances |  | 1
Temporarily impaired securities, 12 months or longer, fair value | $ 29,138 | $ 43,525
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 862 | $ 1,475
Temporarily impaired securities, 12 months or longer, no. Of issuances | 2 | 3
Temporarily impaired securities, total fair value | $ 29,138 | $ 53,475
Temporarily impaired securities, total unrealized losses | $ 862 | $ 1,525
Temporarily impaired securities, total no. Of issuances | 2 | 4
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 | $ 5,833
Temporarily impaired securities, 12 months or longer, unrealized losses | $ 270 | $ 167
Temporarily impaired securities, 12 months or longer, no. Of issuances | 1 | 1
Temporarily impaired securities, total fair value | $ 6,230 | $ 5,833
Temporarily impaired securities, total unrealized losses | $ 270 | $ 167
Temporarily impaired securities, total no. Of issuances | 1 | 1
Preferred Stock of Government Sponsored Entities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | $ 2,488
Temporarily impaired securities, less than 12 months, unrealized losses |  | $ 228
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 |  | $ 2,488
Temporarily impaired securities, total unrealized losses |  | $ 228
Temporarily impaired securities, total no. Of issuances |  | 2
Other Equity Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | $ 158
Temporarily impaired securities, less than 12 months, unrealized losses |  | $ 342
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 |  | $ 158
Temporarily impaired securities, total unrealized losses |  | $ 342
Temporarily impaired securities, total no. Of issuances |  | 1

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