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Note 18 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Carried at Fair Value on a Recurring Basis, and the Method Used to Determine Their Fair Value - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Securities available for sale    
Assets $ 993,445 $ 973,394
Liabilities:    
Liabilities 33,332 31,420
Collateralized Mortgage Backed Securities [Member]    
Securities available for sale    
Assets 668,740 704,933
Other Securities [Member]    
Securities available for sale    
Assets 324,657 268,377
Interest Rate Swaps [Member]    
Securities available for sale    
Assets 48 84
Liabilities:    
Liabilities 4,314 2,649
Borrowings [Member]    
Liabilities:    
Liabilities 29,018 28,771
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale    
Assets 0 0
Liabilities:    
Liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member]    
Securities available for sale    
Assets 0 0
Fair Value, Inputs, Level 1 [Member] | Other Securities [Member]    
Securities available for sale    
Assets 0 0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swaps [Member]    
Securities available for sale    
Assets 0 0
Liabilities:    
Liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Borrowings [Member]    
Liabilities:    
Liabilities 0 0
Fair Value, Inputs, Level 2 [Member]    
Securities available for sale    
Assets 986,233 950,785
Liabilities:    
Liabilities 4,314 2,649
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]    
Securities available for sale    
Assets 668,740 704,933
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]    
Securities available for sale    
Assets 317,445 245,768
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member]    
Securities available for sale    
Assets 48 84
Liabilities:    
Liabilities 4,314 2,649
Fair Value, Inputs, Level 2 [Member] | Borrowings [Member]    
Liabilities:    
Liabilities 0 0
Fair Value, Inputs, Level 3 [Member]    
Securities available for sale    
Assets 7,212 22,609
Liabilities:    
Liabilities 29,018 28,771
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member]    
Securities available for sale    
Assets 0 0
Fair Value, Inputs, Level 3 [Member] | Other Securities [Member]    
Securities available for sale    
Assets 7,212 22,609
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swaps [Member]    
Securities available for sale    
Assets 0 0
Liabilities:    
Liabilities 0 0
Fair Value, Inputs, Level 3 [Member] | Borrowings [Member]    
Liabilities:    
Liabilities $ 29,018 $ 28,771