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Note 11 - 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
Jun. 30, 2015
Dec. 31, 2014
Assets:    
Assets $ 1,037,591 $ 973,394
Liabilities:    
Liabilities 31,187 31,420
Collateralized Mortgage Backed Securities [Member]    
Assets:    
Assets 729,674 704,933
Other Securities [Member]    
Assets:    
Assets 307,823 268,377
Interest Rate Swaps [Member]    
Assets:    
Assets 94 84
Liabilities:    
Liabilities 1,711 2,649
Borrowings [Member]    
Liabilities:    
Liabilities 29,476 28,771
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Assets 1,022,466 950,785
Liabilities:    
Liabilities 1,711 2,649
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]    
Assets:    
Assets 729,674 704,933
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]    
Assets:    
Assets 292,698 245,768
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member]    
Assets:    
Assets 94 84
Liabilities:    
Liabilities 1,711 2,649
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Assets 15,125 22,609
Liabilities:    
Liabilities 29,476 28,771
Fair Value, Inputs, Level 3 [Member] | Other Securities [Member]    
Assets:    
Assets 15,125 22,609
Fair Value, Inputs, Level 3 [Member] | Borrowings [Member]    
Liabilities:    
Liabilities $ 29,476 $ 28,771