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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 1,107,943,000 | $ 1,017,655,000
Temporarily impaired securities, less than 12 months, unrealized losses | 8,809,000 | 13,814,000
Temporarily impaired securities, 12 months or longer, fair value | 56,122,000 | 35,458,000
Temporarily impaired securities, 12 months or longer, unrealized losses | 491,000 | 1,154,000
Temporarily impaired securities, total fair value | 1,164,065,000 | 1,053,113,000
Temporarily impaired securities, total unrealized losses | 9,300,000 | 14,968,000
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 339,707,000 | 299,088,000
Temporarily impaired securities, less than 12 months, unrealized losses | 46,000 | 857,000
Temporarily impaired securities, 12 months or longer, fair value | 49,729,000 |
Temporarily impaired securities, 12 months or longer, unrealized losses | 259,000 |
Temporarily impaired securities, total fair value | 389,436,000 | 299,088,000
Temporarily impaired securities, total unrealized losses | 305,000 | 857,000
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 395,774,000 | 390,331,000
Temporarily impaired securities, less than 12 months, unrealized losses | 6,284,000 | 9,669,000
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, total fair value | 395,774,000 | 390,331,000
Temporarily impaired securities, total unrealized losses | 6,284,000 | 9,669,000
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 1,931,000 |
Temporarily impaired securities, less than 12 months, unrealized losses | 12,000 |
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, total fair value | 1,931,000 |
Temporarily impaired securities, total unrealized losses | 12,000 |
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 359,112,000 | 328,236,000
Temporarily impaired securities, less than 12 months, unrealized losses | 2,359,000 | 3,288,000
Temporarily impaired securities, 12 months or longer, fair value | 122,000 | 62,000
Temporarily impaired securities, 12 months or longer, unrealized losses | 3,000 | 2,000
Temporarily impaired securities, total fair value | 359,234,000 | 328,298,000
Temporarily impaired securities, total unrealized losses | 2,362,000 | 3,290,000
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 1,710,000 |
Temporarily impaired securities, less than 12 months, unrealized losses | 5,000 |
Temporarily impaired securities, 12 months or longer, fair value |  | 28,000
Temporarily impaired securities, 12 months or longer, unrealized losses |  | 20,000
Temporarily impaired securities, total fair value | 1,710,000 | 28,000
Temporarily impaired securities, total unrealized losses | 5,000 | 20,000
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 5,029,000 |
Temporarily impaired securities, less than 12 months, unrealized losses | 5,000 |
Temporarily impaired securities, 12 months or longer, fair value |  | 29,138,000
Temporarily impaired securities, 12 months or longer, unrealized losses |  | 862,000
Temporarily impaired securities, total fair value | 5,029,000 | 29,138,000
Temporarily impaired securities, total unrealized losses | 5,000 | 862,000
Mutual Funds [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 | 6,271,000 | 6,230,000
Temporarily impaired securities, 12 months or longer, unrealized losses | 229,000 | 270,000
Temporarily impaired securities, total fair value | 6,271,000 | 6,230,000
Temporarily impaired securities, total unrealized losses | 229,000 | $ 270,000
Other Equity Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 4,680,000 |
Temporarily impaired securities, less than 12 months, unrealized losses | 98,000 |
Temporarily impaired securities, 12 months or longer, fair value |  |
Temporarily impaired securities, 12 months or longer, unrealized losses |  |
Temporarily impaired securities, total fair value | 4,680,000 |
Temporarily impaired securities, total unrealized losses | $ 98,000 |

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