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Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities available-for-sale |  |
Securities available-for-sale | $ 1,485,124 | $ 1,586,352
Assets | 1,488,531 | 1,589,753
Liabilities |  |
Liabilities | 15,791 | 10,648
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 230,719 | 290,121
Assets | 230,719 | 290,121
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,254,405 | 1,296,231
Assets | 1,257,718 | 1,299,570
Liabilities |  |
Liabilities | 15,791 | 10,648
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets | 94 | 62
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 224,804 | 284,288
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 224,804 | 284,288
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 100,010 | 148,160
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 100,010 | 148,160
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,070,493 | 1,062,269
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 1,070,493 | 1,062,269
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 34 | 36
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 34 | 36
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 73,103 | 73,855
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 73,103 | 73,855
Mutual Funds [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,915 | 5,833
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 5,915 | 5,833
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 2,803 | 3,216
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 2,803 | 3,216
Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 7,962 | 8,695
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities available-for-sale | 7,962 | 8,695
Warrant [Member] |  |
Securities available-for-sale |  |
Assets | 94 | 62
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets | 94 | 62
Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets | 3,313 | 3,339
Liabilities |  |
Liabilities | 913 | 4,124
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Assets | 3,313 | 3,339
Liabilities |  |
Liabilities | 913 | 4,124
Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities | 14,878 | 6,496
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities |  |
Liabilities | $ 14,878 | 6,496
Option Contracts [Member] |  |
Liabilities |  |
Liabilities |  | 28
Option Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities |  |
Liabilities |  | $ 28

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