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Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value $ 207,295 $ 56,619
Less than 12 Months Unrealized Losses 1,870 242
12 Months or Greater Estimated Fair Value 58,954 98,693
12 Months or Greater Unrealized Losses 1,722 2,435
Total Estimated Fair Value 266,249 155,312
Total Unrealized Losses 3,592 2,677
US Government Agencies Debt Securities [Member]    
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 32,927 2,001
Less than 12 Months Unrealized Losses 277 7
12 Months or Greater Estimated Fair Value 0 1,750
12 Months or Greater Unrealized Losses 0 33
Total Estimated Fair Value 32,927 3,751
Total Unrealized Losses 277 40
Residential Mortgage Backed Securities [Member]    
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 157,871 49,644
Less than 12 Months Unrealized Losses 1,438 221
12 Months or Greater Estimated Fair Value 58,954 86,028
12 Months or Greater Unrealized Losses 1,722 2,295
Total Estimated Fair Value 216,825 135,672
Total Unrealized Losses 3,160 2,516
US States and Political Subdivisions Debt Securities [Member]    
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 1,559 4,974
Less than 12 Months Unrealized Losses 3 14
12 Months or Greater Estimated Fair Value 0 10,915
12 Months or Greater Unrealized Losses 0 107
Total Estimated Fair Value 1,559 15,889
Total Unrealized Losses 3 $ 121
Corporate Debt Securities [Member]    
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items]    
Less than 12 Months Estimated Fair Value 14,938  
Less than 12 Months Unrealized Losses 152  
12 Months or Greater Estimated Fair Value 0  
12 Months or Greater Unrealized Losses 0  
Total Estimated Fair Value 14,938  
Total Unrealized Losses $ 152