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Note 5 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Available-for-Sale, Maturing within one year, Amortized Cost $ 1,930  
Available-for-Sale, Maturing within one year, Estimated Fair Value 1,947  
Held-to-Maturity, Maturing within one year, Amortized Cost  
Held-to-Maturity, Maturing within one year, Estimated Fair Value  
Available-for-Sale, Maturing after one to five years, Amortized Cost 6,124  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 6,256  
Held-to-Maturity, Maturing after one to five years, Amortized Cost 1,463  
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 1,509  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 94,262  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 95,782  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 9,653  
Held-to-Maturity, Maturity after five to ten years, Estimated Fair Value 9,674  
Available-for-Sale, Maturing after ten years, Amortized Cost 74,957  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 75,628  
Held-to-Maturity, Maturing after ten years, Amortized Cost 22,436  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 22,586  
Available-for-Sale, Amortized Cost 177,273 $ 197,995
Available-for-Sale, Estimated Fair Value 179,613 198,843
Held-to-Maturity, Amortized Cost 33,552 32,359
Held-to-Maturity, Estimated Fair Value $ 33,769 $ 32,184