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Note 13 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available-for-sale | $ 1,309,853 | $ 1,242,509
Equity securities | 29,261 | 25,098
Assets, fair value disclosure | 1,344,234 | 1,275,998
Liabilities, fair value disclosure | 6,384 | 3,312
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 149,240 | 124,751
Equity securities | 29,261 | 25,098
Assets, fair value disclosure | 178,501 | 149,849
Liabilities, fair value disclosure |  |
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,160,613 | 1,117,758
Equity securities |  |
Assets, fair value disclosure | 1,165,552 | 1,125,965
Liabilities, fair value disclosure | 6,384 | 3,312
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Equity securities |  |
Assets, fair value disclosure | 181 | 184
Liabilities, fair value disclosure |  |
US Treasury Securities [Member] |  |
Securities available-for-sale | 149,240 | 124,751
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 149,240 | 124,751
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 | 5,531 |
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 | 5,531 |
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 |  | 5,871
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 |  | 5,871
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 | 393,274 | 388,363
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 | 393,274 | 388,363
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 | 695,961 | 656,744
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 | 695,961 | 656,744
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 881 | 977
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 | 881 | 977
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 64,966 | 65,803
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 | 64,966 | 65,803
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Mutual Funds [Member] |  |
Equity securities | 6,171 | 6,094
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 6,171 | 6,094
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities |  |
Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 11,443 | 7,822
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 11,443 | 7,822
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities |  |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities |  |
Other Equity Securities [Member] |  |
Equity securities | 11,647 | 11,182
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 11,647 | 11,182
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities |  |
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities |  |
Warrant [Member] |  |
Assets, fair value disclosure | 181 | 184
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 | 181 | 184
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 4,480 | 7,810
Liabilities, fair value disclosure | 5,727 | 1,543
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 | 4,480 | 7,810
Liabilities, fair value disclosure | 5,727 | 1,543
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 | 459 | 397
Liabilities, fair value disclosure | 645 | 1,763
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 | 459 | 397
Liabilities, fair value disclosure | 645 | 1,763
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 | 12 | 6
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 | 12 | 6
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, fair value disclosure |  |

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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