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Note 18 - Fair Value of Financial Instruments - Fair Value Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets $ 745,742 $ 867,731
Liabilities:    
Liabilities 40,744 37,345
Fair Value, Inputs, Level 1 [Member]    
Assets 11,575
Liabilities:    
Liabilities
Fair Value, Inputs, Level 2 [Member]    
Assets 733,057 860,370
Liabilities:    
Liabilities 3,758 3,386
Fair Value, Inputs, Level 3 [Member]    
Assets 1,110 7,361
Liabilities:    
Liabilities 36,986 33,959
Collateralized Mortgage Backed Securities [Member]    
Assets 509,650 516,476
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets 509,650 516,476
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets
Other Securities [Member]    
Assets 228,704 344,905
Other Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets 11,575
Other Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets 216,019 337,544
Other Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets 1,110 7,361
Interest Rate Swap [Member]    
Assets 7,388 6,350
Liabilities:    
Liabilities 3,758 3,386
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets
Liabilities:    
Liabilities
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets 7,388 6,350
Liabilities:    
Liabilities 3,758 3,386
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets
Liabilities:    
Liabilities
Junior Subordinated Debentures [Member]    
Liabilities:    
Liabilities 36,986 33,959
Junior Subordinated Debentures [Member] | Fair Value, Inputs, Level 1 [Member]    
Liabilities:    
Liabilities
Junior Subordinated Debentures [Member] | Fair Value, Inputs, Level 2 [Member]    
Liabilities:    
Liabilities
Junior Subordinated Debentures [Member] | Fair Value, Inputs, Level 3 [Member]    
Liabilities:    
Liabilities $ 36,986 $ 33,959