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Note 16 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Securities available-for-sale |  |
Securities available-for-sale | $ 1,586,352 | $ 1,318,935
Assets | 1,589,753 | 1,320,838
Liabilities |  |
Liabilities | 10,648 | 9,633
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 284,288 | 664,004
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 148,160 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,062,269 | 544,303
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 36 | 45
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 73,855 | 94,472
Mutual Funds [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,833 | 5,866
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 3,216 | 3,224
Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 8,695 | 7,021
Warrant [Member] |  |
Securities available-for-sale |  |
Assets | 62 | 27
Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets | 3,339 | 1,876
Liabilities |  |
Liabilities | 4,124 | 5,007
Option Contracts [Member] |  |
Liabilities |  |
Liabilities | 28 |
Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities | 6,496 | 4,626
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 290,121 | 669,870
Assets | 290,121 | 669,870
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 284,288 | 664,004
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,833 | 5,866
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,296,231 | 649,065
Assets | 1,299,570 | 650,941
Liabilities |  |
Liabilities | 10,648 | 9,633
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 148,160 |
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,062,269 | 544,303
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 36 | 45
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 73,855 | 94,472
Fair Value, Inputs, Level 2 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 3,216 | 3,224
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 8,695 | 7,021
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets | 3,339 | 1,876
Liabilities |  |
Liabilities | 4,124 | 5,007
Fair Value, Inputs, Level 2 [Member] | Option Contracts [Member] |  |
Liabilities |  |
Liabilities | 28 |
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities | 6,496 | 4,626
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets | 62 | 27
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] |  |
Securities available-for-sale |  |
Assets | $ 62 | $ 27

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