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Note 15 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available-for-sale | $ 1,242,509,000 | $ 1,333,626,000
Equity securities | 25,098,000 | 28,100,000
Assets, fair value disclosure | 1,275,998,000 | 1,340,767,000
Liabilities, fair value disclosure | 3,312,000 | 3,161,000
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 124,751,000 | 277,622,000
Equity securities | 25,098,000 |
Assets, fair value disclosure | 149,849,000 | 277,622,000
Liabilities, fair value disclosure |  |
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,117,758,000 | 1,056,004,000
Equity securities |  |
Assets, fair value disclosure | 1,125,965,000 | 1,063,054,000
Liabilities, fair value disclosure | 3,312,000 | 3,161,000
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Equity securities |  |
Assets, fair value disclosure | 184,000 | 91,000
Liabilities, fair value disclosure |  |
US Treasury Securities [Member] |  |
Securities available-for-sale | 124,751,000 | 249,520,000
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 124,751,000 | 249,520,000
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 Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 5,871,000 |
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 | 5,871,000 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 8,988
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  | 8,988
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 388,363,000 | 390,336,000
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 | 388,363,000 | 390,336,000
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 | 656,744,000 | 571,969,000
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 | 656,744,000 | 571,969,000
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 | 977,000 | 1,516,000
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 | 977,000 | 1,516,000
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 65,803,000 | 81,281,000
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 | 65,803,000 | 81,281,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Mutual Funds [Member] |  |
Securities available-for-sale |  | 6,230,000
Equity securities | 6,094,000 |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  | 6,230,000
Equity securities | 6,094,000 |
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Equity securities |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Equity securities |  |
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  | 10,102,000
Equity securities | 7,822,000 |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  | 10,102,000
Equity securities | 7,822,000 |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Equity securities |  |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Equity securities |  |
Other Equity Securities [Member] |  |
Securities available-for-sale |  | 11,770,000
Equity securities | 11,182,000 |
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  | 11,770,000
Equity securities | 11,182,000 |
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Equity securities |  |
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities |  |
Warrant [Member] |  |
Assets, fair value disclosure | 184,000 | 91,000
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 | 184,000 | 91,000
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 7,810,000 | 5,218,000
Liabilities, fair value disclosure | 1,543,000 | 2,699,000
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 | 7,810,000 | 5,218,000
Liabilities, fair value disclosure | 1,543,000 | 2,699,000
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 | 397,000 | 1,832,000
Liabilities, fair value disclosure | 1,763,000 | 453,000
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 | 397,000 | 1,832,000
Liabilities, fair value disclosure | 1,763,000 | 453,000
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 | 6,000 | 9,000
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 | 6,000 | 9,000
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, fair value disclosure |  |

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