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Note 5 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Available-for-Sale, Maturing within one year, Amortized Cost $ 2,119  
Available-for-Sale, Maturing within one year, Estimated Fair Value $ 2,135  
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 $ 4,762  
Available-for-Sale, Maturing after one to five years, Estimated Fair Value 4,921  
Held-to-Maturity, Maturing after one to five years, Amortized Cost 2,271  
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value 2,294  
Available-for-Sale, Maturing after five to ten years, Amortized Cost 114,008  
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value 114,795  
Held-to-Maturity, Maturing after five to ten years, Amortized Cost 9,852  
Held-to-Maturity, Maturity after five to ten years, Estimated Fair Value 9,879  
Available-for-Sale, Maturing after ten years, Amortized Cost 77,103  
Available-for-Sale, Maturing after ten years, Estimated Fair Value 77,637  
Held-to-Maturity, Maturing after ten years, Amortized Cost 19,855  
Held-to-Maturity, Maturing after ten years, Estimated Fair Value 19,830  
Available-for-Sale, Amortized Cost 197,992 $ 197,995
Investment securities available-for-sale, at fair value 199,488 198,843
Investment securities held-to-maturity, at amortized cost 31,978 32,359
Investment securities held-to-maturity, fair value $ 32,003 $ 32,184