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Loans - Impaired Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Impaired loans
Impaired loans, troubled debt restructurings	$ 2,700	$ 3,580
Impaired loans, Unpaid Principal Balance	5,377	6,420
Impaired loans, Recorded Investment in Loans without Specific Reserve	510	1,042
Impaired loans, Recorded Investment in Loans with Specific Reserve	4,670	5,236,000
Impaired loans, Related Allowance	417	879
Impaired loans, Average Balance	5,395	6,603
Impaired loans, Interest Income Recognized	102	183
Real estate - residential mortgage
Impaired loans
Impaired loans, Unpaid Principal Balance	1,550	2,326
Impaired loans, Recorded Investment in Loans without Specific Reserve	402	931
Impaired loans, Recorded Investment in Loans with Specific Reserve	1,042	1,279,000
Impaired loans, Related Allowance	68	77
Impaired loans, Average Balance	1,566	2,353
Impaired loans, Interest Income Recognized	47	105
Commercial, financial and agricultural | Commercial real estate lending
Impaired loans
Impaired loans, Unpaid Principal Balance	1,391	1,397
Impaired loans, Recorded Investment in Loans with Specific Reserve	1,393	1,397,000
Impaired loans, Related Allowance	86	89
Impaired loans, Average Balance	1,394	1,404
Impaired loans, Interest Income Recognized	54	73
Commercial, financial and agricultural | Commercial business lending
Impaired loans
Impaired loans, Unpaid Principal Balance	2,318	2,430
Impaired loans, Recorded Investment in Loans with Specific Reserve	2,235	2,428,000
Impaired loans, Related Allowance	263	585
Impaired loans, Average Balance	2,320	2,573
Equity lines
Impaired loans
Impaired loans, Unpaid Principal Balance	118	120
Impaired loans, Recorded Investment in Loans without Specific Reserve	108	111
Impaired loans, Average Balance	115	119
Impaired loans, Interest Income Recognized	$ 1	2
Consumer
Impaired loans
Impaired loans, Unpaid Principal Balance		147
Impaired loans, Recorded Investment in Loans with Specific Reserve		132,000
Impaired loans, Related Allowance		128
Impaired loans, Average Balance		154
Impaired loans, Interest Income Recognized		$ 3

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Financing Receivables Impaired Troubled Debt Restructuring Amount

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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