Risks and Uncertainties (Summary of Loan Forbearance) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) loan
Risks And Uncertainties [Line Items]
Number of Loans | loan	1,228
Balance | $	$ 274,190
Residential Real Estate Loans [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	121
Balance | $	$ 10,883
Commercial Real Estate Loans [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	388
Balance | $	$ 218,984
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	190
Balance | $	$ 23,801
Consumer Loans To Individuals [Member]
Risks And Uncertainties [Line Items]
Number of Loans | loan	489
Balance | $	$ 11,130