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Note 5 - Securities (Details) - Securities in a Continuous Loss Position - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Temporarily Impaired Securities:    
Securities in a continuous loss position, less than 12 months, fair value $ 113,660 $ 8,636
Securities in a continuous loss position, less than 12 months, unrealized loss 4,344 67
Securities in a continuous loss position, 12 months or more, fair value 98,516 178,042
Securities in a continuous loss position, 12 months or more, unrealized loss 6,593 5,490
US Government Agencies Debt Securities [Member]    
Temporarily Impaired Securities:    
Securities in a continuous loss position, less than 12 months, fair value 81,425 6,964
Securities in a continuous loss position, less than 12 months, unrealized loss 2,993 30
Securities in a continuous loss position, 12 months or more, fair value 88,618 156,149
Securities in a continuous loss position, 12 months or more, unrealized loss 5,666 4,709
US States and Political Subdivisions Debt Securities [Member]    
Temporarily Impaired Securities:    
Securities in a continuous loss position, less than 12 months, fair value 27,353 1,222
Securities in a continuous loss position, less than 12 months, unrealized loss 965 35
Securities in a continuous loss position, 12 months or more, fair value 9,509 19,818
Securities in a continuous loss position, 12 months or more, unrealized loss 873 692
Corporate Debt Securities [Member]    
Temporarily Impaired Securities:    
Securities in a continuous loss position, less than 12 months, fair value 4,882 450
Securities in a continuous loss position, less than 12 months, unrealized loss 386 2
Securities in a continuous loss position, 12 months or more, fair value 200 1,948
Securities in a continuous loss position, 12 months or more, unrealized loss 1 27
Other Debt Obligations [Member]    
Temporarily Impaired Securities:    
Securities in a continuous loss position, 12 months or more, fair value 189 127
Securities in a continuous loss position, 12 months or more, unrealized loss $ 53 $ 62