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Note 15 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available-for-sale | $ 1,451,842 | $ 1,242,509
Equity securities | 28,005 | 25,098
Assets, fair value disclosure | 1,484,478 | 1,275,998
Liabilities, fair value disclosure | 15,651 | 3,312
Equity securities | 28,005 | 25,098
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 74,936 | 124,751
Equity securities | 28,005 | 25,098
Assets, fair value disclosure | 102,941 | 149,849
Liabilities, fair value disclosure | 0 | 0
Equity securities | 28,005 | 25,098
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,376,906 | 1,117,758
Equity securities | 0 | 0
Assets, fair value disclosure | 1,381,498 | 1,125,965
Liabilities, fair value disclosure | 15,651 | 3,312
Equity securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Equity securities | 0 | 0
Assets, fair value disclosure | 39 | 184
Liabilities, fair value disclosure | 0 | 0
Equity securities | 0 | 0
US Treasury Securities [Member] |  |
Securities available-for-sale | 74,936 | 124,751
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 74,936 | 124,751
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 | 90,796 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 90,796 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 |
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 |  | 0
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 |  | 0
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 224,443 | 388,363
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 0 | 0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 224,443 | 388,363
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 887,790 | 656,744
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 | 887,790 | 656,744
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 552 | 977
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 | 552 | 977
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 173,325 | 65,803
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 | 173,325 | 65,803
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale | 0 | 0
Mutual Funds [Member] |  |
Equity securities | 6,277 | 6,094
Equity securities | 6,277 | 6,094
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 6,277 | 6,094
Equity securities | 6,277 | 6,094
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Preferred Stock of Government Sponsored Entities [Member] |  |
Equity securities | 10,529 | 7,822
Equity securities | 10,529 | 7,822
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 10,529 | 7,822
Equity securities | 10,529 | 7,822
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Other Equity Securities [Member] |  |
Equity securities | 11,199 | 11,182
Equity securities | 11,199 | 11,182
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Equity securities | 11,199 | 11,182
Equity securities | 11,199 | 11,182
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity securities | 0 | 0
Equity securities | 0 | 0
Warrant [Member] |  |
Assets, fair value disclosure | 39 | 184
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 | 39 | 184
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 2,181 | 7,810
Liabilities, fair value disclosure | 14,229 | 1,543
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 | 2,181 | 7,810
Liabilities, fair value disclosure | 14,229 | 1,543
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 | 2,411 | 397
Liabilities, fair value disclosure | 1,415 | 1,763
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 | 2,411 | 397
Liabilities, fair value disclosure | 1,415 | 1,763
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 | 6
Option Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, fair value disclosure | 0 | 0
Option Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, fair value disclosure | 7 | 6
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, fair value disclosure | $ 0 | $ 0

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