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Note 12 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Securities available-for-sale |  |
Securities available-for-sale | $ 1,380,879 | $ 1,318,935
Assets | 1,384,279 | 1,320,838
Liabilities |  |
Liabilities | 15,895 | 9,633
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 284,991 | 664,004
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,004,398 | 544,303
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 38 | 45
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 73,830 | 94,472
Mutual Funds [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,899 | 5,866
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 4,517 | 3,224
Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 7,206 | 7,021
Warrant [Member] |  |
Securities available-for-sale |  |
Assets | 37 | 27
Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets | 3,363 | 1,876
Liabilities |  |
Liabilities | 4,895 | 5,007
Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities | 11,000 | 4,626
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 290,890 | 669,870
Assets | 290,890 | 669,870
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 284,991 | 664,004
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,899 | 5,866
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,089,989 | 649,065
Assets | 1,093,352 | 650,941
Liabilities |  |
Liabilities | 15,895 | 9,633
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,004,398 | 544,303
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 38 | 45
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 73,830 | 94,472
Fair Value, Inputs, Level 2 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 4,517 | 3,224
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 7,206 | 7,021
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets | 3,363 | 1,876
Liabilities |  |
Liabilities | 4,895 | 5,007
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities | 11,000 | 4,626
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets | 37 | 27
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] |  |
Securities available-for-sale |  |
Assets | $ 37 | $ 27

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