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Note 3 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-Sale, Amortized Cost $ 172,341 $ 184,278
Available-for-Sale, Gross Unrealized Gains 1,052 936
Available-for-Sale, Gross Unrealized Losses (1,106) (3,304)
Available-for-Sale, Estimated Fair Value 172,287 181,910
Held-to-Maturity, Amortized Cost 28,544 25,904
Held-to-Maturity, Gross Unrealized Gains 82 20
Held-to-Maturity, Gross Unrealized Losses (130) (416)
Held-to-Maturity, Estimated Fair Value 28,496 25,508
Residential Mortgage Backed Securities [Member]    
Available-for-Sale, Amortized Cost 90,308 99,922
Available-for-Sale, Gross Unrealized Gains 564 490
Available-for-Sale, Gross Unrealized Losses (304) (2,003)
Available-for-Sale, Estimated Fair Value 90,568 98,409
Commercial Mortgage Backed Securities [Member]    
Available-for-Sale, Amortized Cost 72,822 71,761
Available-for-Sale, Gross Unrealized Gains 60 56
Available-for-Sale, Gross Unrealized Losses (802) (1,287)
Available-for-Sale, Estimated Fair Value 72,080 70,530
Held-to-Maturity, Amortized Cost 16,950 14,684
Held-to-Maturity, Gross Unrealized Gains 28 5
Held-to-Maturity, Gross Unrealized Losses (55) (148)
Held-to-Maturity, Estimated Fair Value 16,923 14,541
US Government Agencies Debt Securities [Member]    
Available-for-Sale, Amortized Cost 2,000 2,000
Available-for-Sale, Gross Unrealized Gains 2
Available-for-Sale, Gross Unrealized Losses (7)
Available-for-Sale, Estimated Fair Value 2,002 1,993
Held-to-Maturity, Amortized Cost 9,594 9,129
Held-to-Maturity, Gross Unrealized Gains 27 13
Held-to-Maturity, Gross Unrealized Losses (71) (222)
Held-to-Maturity, Estimated Fair Value 9,550 8,920
US States and Political Subdivisions Debt Securities [Member]    
Available-for-Sale, Amortized Cost 7,131 9,759
Available-for-Sale, Gross Unrealized Gains 426 390
Available-for-Sale, Gross Unrealized Losses (7)
Available-for-Sale, Estimated Fair Value 7,557 10,142
Held-to-Maturity, Amortized Cost 2,000 2,091
Held-to-Maturity, Gross Unrealized Gains 27 2
Held-to-Maturity, Gross Unrealized Losses (4) (46)
Held-to-Maturity, Estimated Fair Value 2,023 2,047
US Treasury Securities [Member]    
Available-for-Sale, Amortized Cost 80 80
Available-for-Sale, Gross Unrealized Gains
Available-for-Sale, Gross Unrealized Losses
Available-for-Sale, Estimated Fair Value $ 80 80
Corporate Debt Securities [Member]    
Available-for-Sale, Amortized Cost   756
Available-for-Sale, Gross Unrealized Gains  
Available-for-Sale, Gross Unrealized Losses  
Available-for-Sale, Estimated Fair Value   $ 756