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Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value $ 128,010 $ 56,619
Less than 12 Months Unrealized Losses 1,405 242
12 Months or Greater Estimated Fair Value 70,155 98,693
12 Months or Greater Unrealized Losses 1,625 2,435
Total Estimated Fair Value 198,165 155,312
Total Unrealized Losses 3,030 2,677
US Government Agencies Debt Securities [Member]    
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 25,511 2,001
Less than 12 Months Unrealized Losses 294 7
12 Months or Greater Estimated Fair Value   1,750
12 Months or Greater Unrealized Losses   33
Total Estimated Fair Value 25,511 3,751
Total Unrealized Losses 294 40
Residential Mortgage Backed Securities [Member]    
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 59,378 49,644
Less than 12 Months Unrealized Losses 425 221
12 Months or Greater Estimated Fair Value 70,155 86,028
12 Months or Greater Unrealized Losses 1,625 2,295
Total Estimated Fair Value 129,533 135,672
Total Unrealized Losses 2,050 2,516
US States and Political Subdivisions Debt Securities [Member]    
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 31,814 4,974
Less than 12 Months Unrealized Losses 627 14
12 Months or Greater Estimated Fair Value   10,915
12 Months or Greater Unrealized Losses   107
Total Estimated Fair Value 31,814 15,889
Total Unrealized Losses 627 $ 121
Corporate Debt Securities [Member]    
Note 3 - Investment Securities Available-for-Sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 11,307  
Less than 12 Months Unrealized Losses 59  
Total Estimated Fair Value 11,307  
Total Unrealized Losses $ 59