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Note 13 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale | $ 1,146,102 | $ 1,451,842
Equity securities | 24,570 | 28,005
Assets, fair value disclosure | 1,176,056 | 1,484,478
Liabilities, fair value disclosure | 34,297 | 15,651
Equity securities | 24,570 | 28,005
US Treasury Securities [Member] |  |
Securities available-for-sale | 99,927 | 74,936
US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 107,393 |
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale |  | 90,796
Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 802,412 | 887,790
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  | 224,443
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 301 | 552
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 136,069 | 173,325
Mutual Funds [Member] |  |
Equity securities | 6,431 | 6,277
Equity securities | 6,431 | 6,277
Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 4,868 | 10,529
Equity securities | 4,868 | 10,529
Other Equity Securities [Member] |  |
Equity securities | 13,271 | 11,199
Equity securities | 13,271 | 11,199
Warrant [Member] |  |
Assets, fair value disclosure | 13 | 39
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 3,842 | 2,181
Liabilities, fair value disclosure | 33,760 | 14,229
Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 1,529 | 2,411
Liabilities, fair value disclosure | 531 | 1,415
Option Contracts [Member] |  |
Liabilities, fair value disclosure | 6 | 7
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 99,927 | 74,936
Equity securities | 24,570 | 28,005
Assets, fair value disclosure | 124,497 | 102,941
Liabilities, fair value disclosure | 0 | 0
Equity securities | 24,570 | 28,005
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale | 99,927 | 74,936
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 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] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  | 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 | 6,431 | 6,277
Equity securities | 6,431 | 6,277
Fair Value, Inputs, Level 1 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 4,868 | 10,529
Equity securities | 4,868 | 10,529
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member] |  |
Equity securities | 13,271 | 11,199
Equity securities | 13,271 | 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 | 1,046,175 | 1,376,906
Equity securities | 0 | 0
Assets, fair value disclosure | 1,051,546 | 1,381,498
Liabilities, fair value disclosure | 34,297 | 15,651
Equity securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 107,393 |
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 | 802,412 | 887,790
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  | 224,443
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 301 | 552
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale | 136,069 | 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 | 3,842 | 2,181
Liabilities, fair value disclosure | 33,760 | 14,229
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 1,529 | 2,411
Liabilities, fair value disclosure | 531 | 1,415
Fair Value, Inputs, Level 2 [Member] | Option Contracts [Member] |  |
Liabilities, fair value disclosure | 6 | 7
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Equity securities | 0 | 0
Assets, fair value disclosure | 13 | 39
Liabilities, fair value disclosure | 0 | 0
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale | 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 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] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  | 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 | 13 | 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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