Risks and Uncertainties (Summary of Loan Forbearance) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) loan
Risks And Uncertainties [Line Items]
Number of Loans | loan	1,191
Balance | $	$ 273,365
Residential Real Estate Loans [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	117
Balance | $	$ 10,723
Commercial Real Estate Loans [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	384
Balance | $	$ 218,891
Agricultural Real Estate Loans [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	16
Balance | $	$ 5,267
Construction Real Estate Loans [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	24
Balance | $	$ 4,125
Commercial, Financial And Agricultural [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	183
Balance | $	$ 23,677
Consumer Loans To Individuals [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	467
Balance | $	$ 10,682