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Note 3 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-Sale, Maturing within one year, Amortized Cost $ 1,921  
Available-for-Sale, Maturing within one year, Estimated Fair Value 1,929  
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 4,654  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 4,705  
Held-to-Maturity, Maturing after one to five years, Amortized Cost 1,986  
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 1,995  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 83,901  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 82,804  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 3,335  
Held-to-Maturity, Maturity after five to ten years, Estimated Fair Value 3,268  
Available-for-Sale, Maturing after ten years, Amortized Cost 93,802  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 92,472  
Held-to-Maturity, Maturing after ten years, Amortized Cost 20,583  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 20,245  
Available-for-Sale, Amortized Cost 184,278 $ 197,995
Available-for-Sale, Estimated Fair Value 181,910 198,843
Held-to-Maturity, Amortized Cost 25,904 32,359
Held-to-Maturity, Estimated Fair Value $ 25,508 $ 32,184