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Note 3 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-Sale, Maturing within one year, Amortized Cost $ 381  
Available-for-Sale, Maturing within one year, Estimated Fair Value 385  
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 8,581  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 8,654  
Held-to-Maturity, Maturing after one to five years, Amortized Cost 2,230  
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 2,264  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 74,675  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 74,888  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 2,908  
Held-to-Maturity, Maturity after five to ten years, Estimated Fair Value 2,899  
Available-for-Sale, Maturing after ten years, Amortized Cost 88,704  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 88,360  
Held-to-Maturity, Maturing after ten years, Amortized Cost 23,406  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 23,333  
Available-for-Sale, Amortized Cost 172,341 $ 184,278
Available-for-Sale, Estimated Fair Value 172,287 181,910
Held-to-Maturity, Amortized Cost 28,544 25,904
Held-to-Maturity, Estimated Fair Value $ 28,496 $ 25,508