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Note 3 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available-for-Sale, Maturing within one year, Amortized Cost $ 1,089  
Available-for-Sale, Maturing within one year, Estimated Fair Value 1,093  
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 6,172  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 6,245  
Held-to-Maturity, Maturing after one to five years, Amortized Cost 2,289  
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 2,303  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 82,184  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 81,875  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 2,913  
Held-to-Maturity, Maturity after five to ten years, Estimated Fair Value 2,876  
Available-for-Sale, Maturing after ten years, Amortized Cost 95,631  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 94,645  
Held-to-Maturity, Maturing after ten years, Amortized Cost 24,437  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 24,179  
Available-for-Sale, Amortized Cost 185,076 $ 184,278
Available-for-Sale, Estimated Fair Value 183,858 181,910
Held-to-Maturity, Amortized Cost 29,639 25,904
Held-to-Maturity, Estimated Fair Value $ 29,358 $ 25,508