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Note 11 - Fair Value of Financial Instruments - Fair Value Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Assets $ 545,067 $ 668,740
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets:    
Assets
Collateralized Mortgage Backed Securities [Member]    
Assets:    
Assets 545,067 668,740
Other Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Assets 358,621 317,445
Other Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets:    
Assets 7,191 7,212
Other Securities [Member]    
Assets:    
Assets 365,812 324,657
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Assets 48
Liabilities:    
Liabilities 15,426 4,314
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets:    
Assets
Liabilities:    
Liabilities
Interest Rate Swap [Member]    
Assets:    
Assets 48
Liabilities:    
Liabilities 15,426 4,314
Borrowed Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Liabilities:    
Liabilities
Borrowed Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Liabilities:    
Liabilities 27,791 29,018
Borrowed Funds [Member]    
Liabilities:    
Liabilities 27,791 29,018
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Assets 903,688 986,233
Liabilities:    
Liabilities 15,426 4,314
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Assets 7,191 7,212
Liabilities:    
Liabilities 27,791 29,018
Assets 910,879 993,445
Liabilities $ 43,217 $ 33,332