Fair Value Measurements, Measured On A Recurring And Nonrecurring Basis (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired loans, estimated selling cost	$ 351,000	$ 356,000
Recurring [Member]
Assets [Abstract]
Equity securities	2,118,000	1,931,000
Available for sale securities [Abstract]
U.S. Agency Securities	79,709,000	81,416,000
U.S. Treasury securities	40,362,000	28,043,000
Obligations of state and political subdivisions	102,345,000	102,972,000
Corporate obligations	6,983,000	6,509,000
Mortgage-backed securities in government sponsored entities	92,568,000	76,249,000
Other Assets [Abstract]
Derivative instruments	4,651,000	1,111,000
Liabilities [Abstract]
Derivative instruments	(2,615,000)	(1,122,000)
Recurring [Member] | Level I [Member]
Assets [Abstract]
Equity securities	2,118,000	1,931,000
Available for sale securities [Abstract]
U.S. Agency Securities	0	0
U.S. Treasury securities	40,362,000	28,043,000
Obligations of state and political subdivisions	0	0
Corporate obligations	0	0
Mortgage-backed securities in government sponsored entities	0	0
Other Assets [Abstract]
Derivative instruments	0	0
Liabilities [Abstract]
Derivative instruments	0	0
Recurring [Member] | Level II [Member]
Assets [Abstract]
Equity securities	0	0
Available for sale securities [Abstract]
U.S. Agency Securities	79,709,000	81,416,000
U.S. Treasury securities	0	0
Obligations of state and political subdivisions	102,345,000	102,972,000
Corporate obligations	6,983,000	6,509,000
Mortgage-backed securities in government sponsored entities	92,568,000	76,249,000
Other Assets [Abstract]
Derivative instruments	4,651,000	1,111,000
Liabilities [Abstract]
Derivative instruments	(2,615,000)	(1,122,000)
Recurring [Member] | Level III [Member]
Assets [Abstract]
Equity securities	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
Other Assets [Abstract]
Derivative instruments	0	0
Liabilities [Abstract]
Derivative instruments	0	0
Nonrecurring [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	3,264,000	3,243,000
Other real estate owned	1,527,000	1,700,000
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	3,264,000	3,243,000
Other real estate owned	$ 1,527,000	$ 1,700,000