Fair Value Measurements, Measured On A Recurring And Nonrecurring Basis (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired loans, estimated selling cost	$ 104,000	$ 91,000
Recurring [Member]
Securities available for sale [Abstract]
U.S. Agency securities	190,766,000	199,591,000
U.S. Treasuries securities	5,020,000	10,082,000
Obligations of state and political subdivisions	102,222,000	102,863,000
Corporate obligations	14,376,000	14,565,000
Mortgage-backed securities in government sponsored entities	34,052,000	30,204,000
Equity securities in financial institutions	2,718,000	2,432,000
Recurring [Member] | Level I [Member]
Securities available for sale [Abstract]
U.S. Agency securities	0	0
U.S. Treasuries securities	5,020,000	10,082,000
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	2,718,000	2,432,000
Recurring [Member] | Level II [Member]
Securities available for sale [Abstract]
U.S. Agency securities	190,766,000	199,591,000
U.S. Treasuries securities	0	0
Obligations of state and political subdivisions	102,222,000	102,863,000
Corporate obligations	14,376,000	14,565,000
Mortgage-backed securities in government sponsored entities	34,052,000	30,204,000
Equity securities in financial institutions	0	0
Recurring [Member] | Level III [Member]
Securities available for sale [Abstract]
U.S. Agency securities	0	0
U.S. Treasuries 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	830,000	894,000
Other real estate owned	799,000	1,197,000
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	830,000	894,000
Other real estate owned	$ 799,000	$ 1,197,000