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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 60,343 | $ 176,667
Temporarily impaired securities, less than 12 months, unrealized losses | 57 | 629
Temporarily impaired securities, 12 months or longer, fair value | 763,721 | 899,523
Temporarily impaired securities, 12 months or longer, unrealized losses | 4,368 | 26,371
Temporarily impaired securities, total fair value | 824,064 | 1,076,190
Temporarily impaired securities, total unrealized losses | 4,425 | 27,000
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 23,606 | 3,388
Temporarily impaired securities, less than 12 months, unrealized losses | 7 | 77
Temporarily impaired securities, 12 months or longer, fair value | 4,334 | 2,483
Temporarily impaired securities, 12 months or longer, unrealized losses | 151 | 118
Temporarily impaired securities, total fair value | 27,940 | 5,871
Temporarily impaired securities, total unrealized losses | 158 | 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 |  | 50
Temporarily impaired securities, 12 months or longer, fair value |  | 0
Temporarily impaired securities, 12 months or longer, unrealized losses |  | 0
Temporarily impaired securities, total fair value |  | 124,751
Temporarily impaired securities, total unrealized losses |  | 50
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, 12 months or longer, fair value | 398,340 | 388,362
Temporarily impaired securities, 12 months or longer, unrealized losses | 1,660 | 11,638
Temporarily impaired securities, total fair value | 398,340 | 388,362
Temporarily impaired securities, total unrealized losses | 1,660 | 11,638
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 2,874 | 48,528
Temporarily impaired securities, less than 12 months, unrealized losses | 7 | 502
Temporarily impaired securities, 12 months or longer, fair value | 360,270 | 507,701
Temporarily impaired securities, 12 months or longer, unrealized losses | 2,539 | 14,587
Temporarily impaired securities, total fair value | 363,144 | 556,229
Temporarily impaired securities, total unrealized losses | 2,546 | 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, 12 months or longer, fair value | 777 | 977
Temporarily impaired securities, 12 months or longer, unrealized losses | 18 | 28
Temporarily impaired securities, total fair value | 777 | 977
Temporarily impaired securities, total unrealized losses | 18 | $ 28
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 33,863 |
Temporarily impaired securities, less than 12 months, unrealized losses | 43 |
Temporarily impaired securities, 12 months or longer, fair value | 0 |
Temporarily impaired securities, 12 months or longer, unrealized losses | 0 |
Temporarily impaired securities, total fair value | 33,863 |
Temporarily impaired securities, total unrealized losses | $ 43 |

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