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Note 13 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available-for-sale | $ 1,427,438 | $ 1,242,509
Equity securities | 32,862 | 25,098
Assets, fair value disclosure | 1,462,993 | 1,275,998
Liabilities, fair value disclosure | 20,175 | 3,312
Securities available-for-sale |  |
Securities available-for-sale | 1,427,438 | 1,242,509
Equity securities | 32,862 | 25,098
Assets, fair value disclosure | 1,462,993 | 1,275,998
Liabilities, fair value disclosure | 20,175 | 3,312
US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 92,954 |
Securities available-for-sale |  |
Securities available-for-sale | 92,954 |
US Treasury Securities [Member] |  |
Securities available-for-sale |  | 124,751
Securities available-for-sale |  |
Securities available-for-sale |  | 124,751
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 347,699 | 388,363
Securities available-for-sale |  |
Securities available-for-sale | 347,699 | 388,363
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 5,871
Securities available-for-sale |  |
Securities available-for-sale |  | 5,871
Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 886,735 | 656,744
Securities available-for-sale |  |
Securities available-for-sale | 886,735 | 656,744
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 665 | 977
Securities available-for-sale |  |
Securities available-for-sale | 665 | 977
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 99,385 | 65,803
Securities available-for-sale |  |
Securities available-for-sale | 99,385 | 65,803
Mutual Funds [Member] |  |
Equity securities | 6,307 | 6,094
Securities available-for-sale |  |
Equity securities | 6,307 | 6,094
Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 15,145 | 7,822
Securities available-for-sale |  |
Equity securities | 15,145 | 7,822
Other Equity Securities [Member] |  |
Equity securities | 11,410 | 11,182
Securities available-for-sale |  |
Equity securities | 11,410 | 11,182
Warrant [Member] |  |
Assets, fair value disclosure | 31 | 184
Securities available-for-sale |  |
Assets, fair value disclosure | 31 | 184
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 1,697 | 7,810
Liabilities, fair value disclosure | 17,734 | 1,543
Securities available-for-sale |  |
Assets, fair value disclosure | 1,697 | 7,810
Liabilities, fair value disclosure | 17,734 | 1,543
Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 965 | 397
Liabilities, fair value disclosure | 2,435 | 1,763
Securities available-for-sale |  |
Assets, fair value disclosure | 965 | 397
Liabilities, fair value disclosure | 2,435 | 1,763
Option Contracts [Member] |  |
Liabilities, fair value disclosure | 6 | 6
Securities available-for-sale |  |
Liabilities, fair value disclosure | 6 | 6
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 124,751
Equity securities | 32,862 | 25,098
Assets, fair value disclosure | 32,862 | 149,849
Liabilities, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 124,751
Equity securities | 32,862 | 25,098
Assets, fair value disclosure | 32,862 | 149,849
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 0 |
Securities available-for-sale |  |
Securities available-for-sale | 0 |
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  | 124,751
Securities available-for-sale |  |
Securities available-for-sale |  | 124,751
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 0
Securities available-for-sale |  |
Securities available-for-sale |  | 0
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |  |
Equity securities | 6,307 | 6,094
Securities available-for-sale |  |
Equity securities | 6,307 | 6,094
Fair Value, Inputs, Level 1 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 15,145 | 7,822
Securities available-for-sale |  |
Equity securities | 15,145 | 7,822
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member] |  |
Equity securities | 11,410 | 11,182
Securities available-for-sale |  |
Equity securities | 11,410 | 11,182
Fair Value, Inputs, Level 1 [Member] | Warrant [Member] |  |
Assets, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Assets, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Option Contracts [Member] |  |
Liabilities, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,427,438 | 1,117,758
Equity securities | 0 | 0
Assets, fair value disclosure | 1,430,100 | 1,125,965
Liabilities, fair value disclosure | 20,175 | 3,312
Securities available-for-sale |  |
Securities available-for-sale | 1,427,438 | 1,117,758
Equity securities | 0 | 0
Assets, fair value disclosure | 1,430,100 | 1,125,965
Liabilities, fair value disclosure | 20,175 | 3,312
Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 92,954 |
Securities available-for-sale |  |
Securities available-for-sale | 92,954 |
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  | 0
Securities available-for-sale |  |
Securities available-for-sale |  | 0
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 347,699 | 388,363
Securities available-for-sale |  |
Securities available-for-sale | 347,699 | 388,363
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 5,871
Securities available-for-sale |  |
Securities available-for-sale |  | 5,871
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 886,735 | 656,744
Securities available-for-sale |  |
Securities available-for-sale | 886,735 | 656,744
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 665 | 977
Securities available-for-sale |  |
Securities available-for-sale | 665 | 977
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale | 99,385 | 65,803
Securities available-for-sale |  |
Securities available-for-sale | 99,385 | 65,803
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member] |  |
Equity securities | 0 | 0
Securities available-for-sale |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 0 | 0
Securities available-for-sale |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |
Equity securities | 0 | 0
Securities available-for-sale |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Warrant [Member] |  |
Assets, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Assets, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 1,697 | 7,810
Liabilities, fair value disclosure | 17,734 | 1,543
Securities available-for-sale |  |
Assets, fair value disclosure | 1,697 | 7,810
Liabilities, fair value disclosure | 17,734 | 1,543
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 965 | 397
Liabilities, fair value disclosure | 2,435 | 1,763
Securities available-for-sale |  |
Assets, fair value disclosure | 965 | 397
Liabilities, fair value disclosure | 2,435 | 1,763
Fair Value, Inputs, Level 2 [Member] | Option Contracts [Member] |  |
Liabilities, fair value disclosure | 6 | 6
Securities available-for-sale |  |
Liabilities, fair value disclosure | 6 | 6
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Equity securities | 0 | 0
Assets, fair value disclosure | 31 | 184
Liabilities, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Equity securities | 0 | 0
Assets, fair value disclosure | 31 | 184
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 0 |
Securities available-for-sale |  |
Securities available-for-sale | 0 |
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  | 0
Securities available-for-sale |  |
Securities available-for-sale |  | 0
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 0
Securities available-for-sale |  |
Securities available-for-sale |  | 0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale | 0 | 0
Securities available-for-sale |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member] |  |
Equity securities | 0 | 0
Securities available-for-sale |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 0 | 0
Securities available-for-sale |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Other Equity Securities [Member] |  |
Equity securities | 0 | 0
Securities available-for-sale |  |
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] |  |
Assets, fair value disclosure | 31 | 184
Securities available-for-sale |  |
Assets, fair value disclosure | 31 | 184
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Option Contracts [Member] |  |
Liabilities, fair value disclosure | 0 | 0
Securities available-for-sale |  |
Liabilities, fair value disclosure | $ 0 | $ 0

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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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