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Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Securities available-for-sale |  |
Securities available-for-sale | $ 1,545,699 | $ 1,318,935
Assets | 1,548,057 | 1,320,838
Liabilities |  |
Liabilities | 7,296 | 9,633
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 300,110 | 664,004
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 50,127 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,101,403 | 544,303
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 40 | 45
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 74,399 | 94,472
Mutual Funds [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,844 | 5,866
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 3,544 | 3,224
Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 10,232 | 7,021
Warrant [Member] |  |
Securities available-for-sale |  |
Assets | 32 | 27
Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets | 2,326 | 1,876
Liabilities |  |
Liabilities | 3,201 | 5,007
Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities | 4,095 | 4,626
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 305,954 | 669,870
Assets | 305,954 | 669,870
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 300,110 | 664,004
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,844 | 5,866
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,239,745 | 649,065
Assets | 1,242,071 | 650,941
Liabilities |  |
Liabilities | 7,296 | 9,633
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 50,127 |
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,101,403 | 544,303
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 40 | 45
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 74,399 | 94,472
Fair Value, Inputs, Level 2 [Member] | Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 3,544 | 3,224
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 10,232 | 7,021
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets | 2,326 | 1,876
Liabilities |  |
Liabilities | 3,201 | 5,007
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities | 4,095 | 4,626
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets | 32 | 27
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] |  |
Securities available-for-sale |  |
Assets | $ 32 | $ 27

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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