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Note 6 - Investment Securities Available for Sale - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Due in one year or less, amortized costs $ 3,922  
Due in one year or less, fair value 3,975  
Due after one year through five years, amortized costs 9,224  
Due after one year through five years, fair value 9,527  
Due after five years through ten years, amortized costs 11,400  
Due after five years through ten years, fair value 11,793  
Due after ten years, amortized costs 84,174  
Due after ten years, fair value 84,867  
Amortized costs 108,720  
Fair Value 110,162  
Proceeds from sales $ 1,322
Gross realized gains 488 51
Gross realized losses