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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, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale | $ 1,355,173 | $ 1,451,842
Equity securities | 18,790 | 28,005
Assets, fair value disclosure | 1,378,354 | 1,484,478
Liabilities, fair value disclosure | 36,529 | 15,651
Equity securities | 18,790 | 28,005
US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 110,410 |
US Treasury Securities [Member] |  |
Securities available-for-sale |  | 74,936
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 175,045 | 224,443
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 90,796
Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 910,004 | 887,790
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 448 | 552
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 159,266 | 173,325
Mutual Funds [Member] |  |
Equity securities | 6,377 | 6,277
Equity securities | 6,377 | 6,277
Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 3,763 | 10,529
Equity securities | 3,763 | 10,529
Other Equity Securities [Member] |  |
Equity securities | 8,650 | 11,199
Equity securities | 8,650 | 11,199
Warrant [Member] |  |
Assets, fair value disclosure | 24 | 39
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 3,210 | 2,181
Liabilities, fair value disclosure | 32,304 | 14,229
Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 1,157 | 2,411
Liabilities, fair value disclosure | 4,211 | 1,415
Option Contracts [Member] |  |
Liabilities, fair value disclosure | 14 | 7
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 74,936
Equity securities | 18,790 | 28,005
Assets, fair value disclosure | 18,790 | 102,941
Liabilities, fair value disclosure | 0 | 0
Equity securities | 18,790 | 28,005
Fair Value, Inputs, Level 1 [Member] | US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 0 |
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  | 74,936
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 0
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |  |
Equity securities | 6,377 | 6,277
Equity securities | 6,377 | 6,277
Fair Value, Inputs, Level 1 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 3,763 | 10,529
Equity securities | 3,763 | 10,529
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member] |  |
Equity securities | 8,650 | 11,199
Equity securities | 8,650 | 11,199
Fair Value, Inputs, Level 1 [Member] | Warrant [Member] |  |
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
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] |  |
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
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,355,173 | 1,376,906
Equity securities | 0 | 0
Assets, fair value disclosure | 1,359,540 | 1,381,498
Liabilities, fair value disclosure | 36,529 | 15,651
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 110,410 |
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  | 0
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 175,045 | 224,443
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 90,796
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 910,004 | 887,790
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 448 | 552
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale | 159,266 | 173,325
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Warrant [Member] |  |
Assets, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 3,210 | 2,181
Liabilities, fair value disclosure | 32,304 | 14,229
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 1,157 | 2,411
Liabilities, fair value disclosure | 4,211 | 1,415
Fair Value, Inputs, Level 2 [Member] | Option Contracts [Member] |  |
Liabilities, fair value disclosure | 14 | 7
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Equity securities | 0 | 0
Assets, fair value disclosure | 24 | 39
Liabilities, fair value disclosure | 0 | 0
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 0 |
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  | 0
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Other Equity Securities [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] |  |
Assets, fair value disclosure | 24 | 39
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
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
Fair Value, Inputs, Level 3 [Member] | Option Contracts [Member] |  |
Liabilities, fair value disclosure | $ 0 | $ 0

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