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Note 15 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available-for-sale | $ 1,333,626 | $ 1,314,345
Assets, fair value disclosure | 1,340,767 | 1,316,664
Liabilities, fair value disclosure | 3,161 | 6,997
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 277,622 | 513,376
Assets, fair value disclosure | 277,622 | 513,376
Liabilities, fair value disclosure |  |
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,056,004 | 800,969
Assets, fair value disclosure | 1,063,054 | 803,209
Liabilities, fair value disclosure | 3,161 | 6,997
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets, fair value disclosure | 91 | 79
Liabilities, fair value disclosure |  |
US Treasury Securities [Member] |  |
Securities available-for-sale | 249,520 | 489,017
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 249,520 | 489,017
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 Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 8,988 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 8,988 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 390,336 | 390,331
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 | 390,336 | 390,331
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 | 571,969 | 336,260
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 | 571,969 | 336,260
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale | 1,914 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,914 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 1,516 | 28
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 | 1,516 | 28
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 81,281 | 74,350
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 | 81,281 | 74,350
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Mutual Funds [Member] |  |
Securities available-for-sale | 6,230 | 6,230
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 6,230 | 6,230
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 | 10,102 | 7,308
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 10,102 | 7,308
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Other Equity Securities [Member] |  |
Securities available-for-sale | 11,770 | 10,821
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 11,770 | 10,821
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Warrant [Member] |  |
Assets, fair value disclosure | 91 | 79
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 | 91 | 79
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 5,218 | 938
Liabilities, fair value disclosure | 2,699 | 3,744
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 | 5,218 | 938
Liabilities, fair value disclosure | 2,699 | 3,744
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 | 1,832 | 1,302
Liabilities, fair value disclosure | 453 | 3,132
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 | 1,832 | 1,302
Liabilities, fair value disclosure | 453 | 3,132
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 | 9 | 121
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 | 9 | 121
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, fair value disclosure |  |

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