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Note 11 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | $ 390,009 | $ 284,288
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 390,009 | 284,288
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 250,010 | 148,160
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 250,010 | 148,160
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 563,638 | 1,062,269
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 563,638 | 1,062,269
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 30 | 36
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 30 | 36
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 74,469 | 73,855
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 74,469 | 73,855
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 5,926 | 5,833
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Mutual Funds [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 5,926 | 5,833
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 3,188 | 3,216
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 3,188 | 3,216
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 11,199 | 8,695
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 11,199 | 8,695
Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Assets, Fair Value Disclosure |  |
Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Assets, Fair Value Disclosure |  |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets, Fair Value Disclosure | 75 | 62
Warrant [Member] |  |
Securities available-for-sale |  |
Assets, Fair Value Disclosure | 75 | 62
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Assets, Fair Value Disclosure |  |
Liabilities |  |
Liabilities, Fair Value Disclosure |  |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Assets, Fair Value Disclosure | 1,711 | 3,339
Liabilities |  |
Liabilities, Fair Value Disclosure | 712 | 4,124
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets, Fair Value Disclosure |  |
Liabilities |  |
Liabilities, Fair Value Disclosure |  |
Foreign Exchange Contract [Member] |  |
Securities available-for-sale |  |
Assets, Fair Value Disclosure | 1,711 | 3,339
Liabilities |  |
Liabilities, Fair Value Disclosure | 712 | 4,124
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure | 15,186 | 6,496
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure |  |
Interest Rate Swap [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure | 15,186 | 6,496
Option Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure |  |
Option Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure |  | 28
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure |  |
Option Contracts [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure |  | 28
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 395,935 | 290,121
Assets, Fair Value Disclosure | 395,935 | 290,121
Liabilities |  |
Liabilities, Fair Value Disclosure |  |
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities | 902,534 | 1,296,231
Assets, Fair Value Disclosure | 904,245 | 1,299,570
Liabilities |  |
Liabilities, Fair Value Disclosure | 15,898 | 10,648
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities |  |
Assets, Fair Value Disclosure | 75 | 62
Liabilities |  |
Liabilities, Fair Value Disclosure |  |
Available-for-sale Securities | 1,298,469 | 1,586,352
Assets, Fair Value Disclosure | 1,300,255 | 1,589,753
Liabilities, Fair Value Disclosure | $ 15,898 | $ 10,648

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