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Note 12 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale, Total | $ 1,475,949,000 | $ 1,333,626,000
Equity Securities, FV-NI | 23,131,000 | 28,100,000
Assets, fair value disclosure | 1,514,446,000 | 1,340,767,000
Liabilities, fair value disclosure | 2,249,000 | 3,161,000
Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total | 348,544,000 | 277,622,000
Equity Securities, FV-NI | 23,131,000 |
Assets, fair value disclosure | 371,675,000 | 277,622,000
Liabilities, fair value disclosure |  |
Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total | 1,127,405,000 | 1,056,004,000
Equity Securities, FV-NI |  |
Assets, fair value disclosure | 1,142,595,000 | 1,063,054,000
Liabilities, fair value disclosure | 2,249,000 | 3,161,000
Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Equity Securities, FV-NI |  |
Assets, fair value disclosure | 176,000 | 91,000
Liabilities, fair value disclosure |  |
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale, Total | 348,544,000 | 249,520,000
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total | 348,544,000 | 249,520,000
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
US Government Corporations and Agencies Securities [Member] |  |
Debt Securities, Available-for-sale, Total | 8,189,000 | 8,988,000
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total | 8,189,000 | 8,988,000
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-sale, Total | 383,959,000 | 390,336,000
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total | 383,959,000 | 390,336,000
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale, Total | 658,288,000 | 571,969,000
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total | 658,288,000 | 571,969,000
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale, Total |  | 1,914,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total |  | 1,914,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-sale, Total | 1,203,000 | 1,516,000
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total | 1,203,000 | 1,516,000
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale, Total | 75,766,000 | 81,281,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total | 75,766,000 | 81,281,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Mutual Funds [Member] |  |
Debt Securities, Available-for-sale, Total |  | 6,230,000
Equity Securities, FV-NI | 6,082,000 |
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  | 6,230,000
Equity Securities, FV-NI | 6,082,000 |
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Equity Securities, FV-NI |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Equity Securities, FV-NI |  |
Preferred Stock of Government Sponsored Entities [Member] |  |
Debt Securities, Available-for-sale, Total |  | 10,102,000
Equity Securities, FV-NI | 7,480,000 |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  | 10,102,000
Equity Securities, FV-NI | 7,480,000 |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Equity Securities, FV-NI |  |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Equity Securities, FV-NI |  |
Other Equity Securities [Member] |  |
Debt Securities, Available-for-sale, Total |  | 11,770,000
Equity Securities, FV-NI | 9,569,000 |
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale, Total |  | 11,770,000
Equity Securities, FV-NI | 9,569,000 |
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale, Total |  |
Equity Securities, FV-NI |  |
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Equity Securities, FV-NI |  |
Warrant [Member] |  |
Assets, fair value disclosure | 176,000 | 91,000
Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure |  |
Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure |  |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure | 176,000 | 91,000
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 14,801,000 | 5,218,000
Liabilities, fair value disclosure | 157,000 | 2,699,000
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure |  |
Liabilities, fair value disclosure |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure | 14,801,000 | 5,218,000
Liabilities, fair value disclosure | 157,000 | 2,699,000
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure |  |
Liabilities, fair value disclosure |  |
Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 389,000 | 1,832,000
Liabilities, fair value disclosure | 2,083,000 | 453,000
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure |  |
Liabilities, fair value disclosure |  |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure | 389,000 | 1,832,000
Liabilities, fair value disclosure | 2,083,000 | 453,000
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure |  |
Liabilities, fair value disclosure |  |
Option Contracts [Member] |  |
Liabilities, fair value disclosure | 9,000 | 9,000
Option Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, fair value disclosure |  |
Option Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, fair value disclosure | 9,000 | 9,000
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, fair value disclosure |  |

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