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Note 11 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Securities available-for-sale | $ 1,227,729,000 | $ 1,314,345,000 | [1] | $ 1,300,000,000
Assets, fair value disclosure | 1,230,830,000 | 1,316,664,000 |  |
Liabilities, fair value disclosure | 4,055,000 | 6,997,000 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale | 440,570,000 | 513,376,000 | [1] |
Assets, fair value disclosure | 440,570,000 | 513,376,000 |  |
Liabilities, fair value disclosure |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale | 787,159,000 | 800,969,000 | [1] |
Assets, fair value disclosure | 790,158,000 | 803,209,000 |  |
Liabilities, fair value disclosure | 4,055,000 | 6,997,000 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  | [1] |
Assets, fair value disclosure | 102,000 | 79,000 |  |
Liabilities, fair value disclosure |  |  |  |
US Treasury Securities [Member] |  |  |  |
Securities available-for-sale | 419,470,000 | 489,017,000 |  |
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale | 419,470,000 | 489,017,000 |  |
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |  |  |
Securities available-for-sale | 391,986,000 | 390,331,000 |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale | 391,986,000 | 390,331,000 |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Securities available-for-sale | 320,163,000 | 336,260,000 |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale | 320,163,000 | 336,260,000 |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Corporate Debt Securities [Member] |  |  |  |
Securities available-for-sale | 75,011,000 | 74,350,000 |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale | 75,010,000 | 74,350,000 |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Collateralized Mortgage Obligations [Member] |  |  |  |
Securities available-for-sale |  | 28,000 |  |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale |  | 28,000 |  |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Mutual Funds [Member] |  |  |  |
Securities available-for-sale | 6,230,000 | 6,230,000 |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale | 6,230,000 | 6,230,000 |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Preferred Stock of Government Sponsored Entities [Member] |  |  |  |
Securities available-for-sale | 5,978,000 | 7,308,000 | [2] |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale | 5,978,000 | 7,308,000 | [2] |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale |  |  | [2] |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  | [2] |
Other Equity Securities [Member] |  |  |  |
Securities available-for-sale | 8,892,000 | 10,821,000 | [2] |
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Securities available-for-sale | 8,892,000 | 10,821,000 | [2] |
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Securities available-for-sale |  |  | [2] |
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Securities available-for-sale |  |  |  |
Warrant [Member] |  |  |  |
Assets, fair value disclosure | 102,000 | 79,000 |  |
Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure | 102,000 | 79,000 |  |
Interest Rate Swap [Member] |  |  |  |
Assets, fair value disclosure | 1,851,000 | 938,000 |  |
Liabilities, fair value disclosure | 3,228,000 | 3,744,000 |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Liabilities, fair value disclosure |  |  |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, fair value disclosure | 1,851,000 | 938,000 |  |
Liabilities, fair value disclosure | 3,228,000 | 3,744,000 |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Liabilities, fair value disclosure |  |  |  |
Foreign Exchange Contract [Member] |  |  |  |
Assets, fair value disclosure | 1,148,000 | 1,302,000 |  |
Liabilities, fair value disclosure | 647,000 | 3,132,000 |  |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Liabilities, fair value disclosure |  |  |  |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, fair value disclosure | 1,148,000 | 1,302,000 |  |
Liabilities, fair value disclosure | 647,000 | 3,132,000 |  |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Liabilities, fair value disclosure |  |  |  |
Option Contracts [Member] |  |  |  |
Liabilities, fair value disclosure | 180,000 | 121,000 |  |
Option Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Liabilities, fair value disclosure |  |  |  |
Option Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Liabilities, fair value disclosure | 180,000 | 121,000 |  |
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Liabilities, fair value disclosure |  |  |  |
[1] | Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.
[2] | Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.

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