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Note 11 - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available-for-sale    
Available-for-sale Securities $ 240,039 $ 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 240,039 284,288
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 125,142 148,160
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 125,142 148,160
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 783,313 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 783,313 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 32 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 32 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 73,229 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 73,229 73,855
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available-for-sale    
Available-for-sale Securities 5,953 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 5,953 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 4,160 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 4,160 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 10,036 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 10,036 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 90 62
Warrant [Member]    
Securities available-for-sale    
Assets, Fair Value Disclosure 90 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 2,083 3,339
Liabilities    
Liabilities, Fair Value Disclosure 1,602 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 2,083 3,339
Liabilities    
Liabilities, Fair Value Disclosure 1,602 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 18,050 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 18,050 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 245,992 290,121
Assets, Fair Value Disclosure 245,992 290,121
Liabilities    
Liabilities, Fair Value Disclosure
Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Available-for-sale Securities 995,912 1,296,231
Assets, Fair Value Disclosure 997,995 1,299,570
Liabilities    
Liabilities, Fair Value Disclosure 19,652 10,648
Fair Value, Inputs, Level 3 [Member]    
Securities available-for-sale    
Available-for-sale Securities
Assets, Fair Value Disclosure 90 62
Liabilities    
Liabilities, Fair Value Disclosure
Available-for-sale Securities 1,241,904 1,586,352
Assets, Fair Value Disclosure 1,244,077 1,589,753
Liabilities, Fair Value Disclosure $ 19,652 $ 10,648