Allowance for Credit Losses (Non-accrual Basis By Loan Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 1,571	$ 1,921
Commercial, financial and agricultural | Domestic | Commercial.
Loan loss allowances, financing receivable past due
Non-accrual loans, total	238	298
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	333	562
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily
Loan loss allowances, financing receivable past due
Non-accrual loans, total	123	131
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development
Loan loss allowances, financing receivable past due
Non-accrual loans, total	564	589
Real estate - mortgage | Domestic | Residential: first lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 313	$ 341