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Note 2 - Investment Securities - Amortized Cost and Aggregate Fair Value of Available For Sale and Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities available for sale, due within one year, amortized cost $ 17,643  
Securities available for sale, due within one year, fair value 17,632  
Securities available for sale, due after one year but within five years, amortized cost 4,725  
Securities available for sale, due after one year but within five years, fair value 4,818  
Securities available for sale, due after five years but within ten years, amortized cost 97,909  
Securities available for sale, due after five years but within ten years, fair value 100,054  
Securities available for sale, due after ten years, amortized cost 11,448  
Securities available for sale, due after ten years, fair value 11,628  
Securities available for sale, Amortized Cost 155,770 $ 166,450
Securities available for sale 157,854 165,579
Securities held to maturity, due within one year, amortized cost  
Securities held to maturity, due within one year, fair value  
Securities held to maturity, due after one year but within five years, amortized cost 25,216  
Securities held to maturity, due after one year but within five years, fair value 25,288  
Securities held to maturity, due after five years but within ten years, amortized cost  
Securities held to maturity, due after five years but within ten years, fair value  
Securities held to maturity, due after ten years, amortized cost  
Securities held to maturity, due after ten years, fair value  
Securities held to maturity 25,216 47,133
Securities held to maturity, fair value 25,288 47,266
Debt Securities [Member]    
Securities available for sale, Amortized Cost 131,725  
Securities available for sale 134,132  
Collateralized Mortgage Backed Securities [Member]    
Securities available for sale, Amortized Cost 23,990  
Securities available for sale 23,649  
Equity Securities [Member]    
Securities available for sale, Amortized Cost 55 55
Securities available for sale $ 73 $ 73