Fair Value Measurements, Measured On A Recurring And Nonrecurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired loans, estimated selling cost	$ 604	$ 163
Recurring [Member]
Fair Value, Net Asset (Liability) [Abstract]
Equity securities in financial institutions	291	91
Available for sale securities [Abstract]
U.S. Agency Securities	108,269	98,887
U.S. Treasury securities	32,837	28,604
Obligations of state and political subdivisions	51,598	79,090
Corporate obligations	3,000	3,083
Mortgage-backed securities in government sponsored entities	44,722	45,027
Equity securities in financial institutions	291	91
Recurring [Member] | Level I [Member]
Fair Value, Net Asset (Liability) [Abstract]
Equity securities in financial institutions	291	91
Available for sale securities [Abstract]
U.S. Agency Securities	0	0
U.S. Treasury securities	32,837	28,604
Obligations of state and political subdivisions	0	0
Corporate obligations	0	0
Mortgage-backed securities in government sponsored entities	0	0
Equity securities in financial institutions	291	91
Recurring [Member] | Level II [Member]
Fair Value, Net Asset (Liability) [Abstract]
Equity securities in financial institutions	0	0
Available for sale securities [Abstract]
U.S. Agency Securities	108,269	98,887
U.S. Treasury securities	0	0
Obligations of state and political subdivisions	51,598	79,090
Corporate obligations	3,000	3,083
Mortgage-backed securities in government sponsored entities	44,722	45,027
Equity securities in financial institutions	0	0
Recurring [Member] | Level III [Member]
Fair Value, Net Asset (Liability) [Abstract]
Equity securities in financial institutions	0	0
Available for sale securities [Abstract]
U.S. Agency Securities	0	0
U.S. Treasury securities	0	0
Obligations of state and political subdivisions	0	0
Corporate obligations	0	0
Mortgage-backed securities in government sponsored entities	0	0
Equity securities in financial institutions	0	0
Nonrecurring [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	6,281	1,569
Other real estate owned	520	1,024
Nonrecurring [Member] | Level I [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	0	0
Other real estate owned	0	0
Nonrecurring [Member] | Level II [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	0	0
Other real estate owned	0	0
Nonrecurring [Member] | Level III [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	6,281	1,569
Other real estate owned	$ 520	$ 1,024