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Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale | $ 1,036,550 | $ 1,451,842
Equity securities | 23,744 | 28,005
Assets, fair value disclosure | 1,068,382 | 1,484,478
Liabilities, fair value disclosure | 12,486 | 15,651
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 80,948 | 74,936
Equity securities | 23,744 | 28,005
Assets, fair value disclosure | 104,692 | 102,941
Liabilities, fair value disclosure | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 955,602 | 1,376,906
Equity securities | 0 | 0
Assets, fair value disclosure | 963,669 | 1,381,498
Liabilities, fair value disclosure | 12,486 | 15,651
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Equity securities | 0 | 0
Assets, fair value disclosure | 21 | 39
Liabilities, fair value disclosure | 0 | 0
US Treasury Securities [Member] |  |
Securities available-for-sale | 80,948 | 74,936
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 80,948 | 74,936
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 0 | 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 99,838 | 90,796
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 99,838 | 90,796
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 727,068 | 887,790
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 727,068 | 887,790
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  | 224,443
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  | 0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  | 224,443
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  | 0
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 10,324 | 552
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 10,324 | 552
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 118,372 | 173,325
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 118,372 | 173,325
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Mutual Funds [Member] |  |
Equity securities | 6,413 | 6,277
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 6,413 | 6,277
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities | 0 | 0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities | 0 | 0
Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 5,485 | 10,529
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 5,485 | 10,529
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities | 0 | 0
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities | 0 | 0
Other Equity Securities [Member] |  |
Equity securities | 11,846 | 11,199
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 11,846 | 11,199
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities | 0 | 0
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities | 0 | 0
Warrant [Member] |  |
Assets, fair value disclosure | 21 | 39
Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure | 0 | 0
Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure | 0 | 0
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure | 21 | 39
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 3,409 | 2,181
Liabilities, fair value disclosure | 10,286 | 14,229
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure | 3,409 | 2,181
Liabilities, fair value disclosure | 10,286 | 14,229
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 4,658 | 2,411
Liabilities, fair value disclosure | 2,200 | 1,415
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | 0 | 0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure | 4,658 | 2,411
Liabilities, fair value disclosure | 2,200 | 1,415
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure | 0 | 0
Liabilities, fair value disclosure | $ 0 | 0
Option Contracts [Member] |  |
Liabilities, fair value disclosure |  | 7
Option Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, fair value disclosure |  | 0
Option Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, fair value disclosure |  | 7
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, fair value disclosure |  | $ 0

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