Loans Schedule of troubled debt restructurings on financing receivables (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) contracts	Dec. 31, 2020 USD ($) contracts	Dec. 31, 2019 USD ($) contracts
Financing Receivable, Impaired [Line Items]
Troubled Debt Restructuring, Classification removed	$ 4,100,000	$ 2,300,000
TDRs included in nonaccrual loan totals	20,900,000	25,800,000
Nonaccrual TDRs considered current	10,500,000	12,900,000
TDRs included in accruing loan totals	28,300,000	20,900,000
Loans and Leases Receivable, Impaired, Commitment to Lend	3,000,000	6,700,000
Specific Reserves Related To Troubled Debt Restructuring	300,000	200,000
Additional specific reserves related to troubled debt restructuring	174,000	7,000	$ 1,300
Modified substandard commercial loans, total recorded investment	200,000	200,000
Modified substandard consumer loans total recorded investment	32,900,000	57,900,000
Nonaccrual loans not classified as TDRs at prior fiscal year end	$ 5,400,000	$ 400,000	$ 2,100,000
Financing Receivable, Modifications, Number of Contracts | contracts	195	292	443
Total Recorded Investment Modified as TDRs During Period	$ 13,484,000	$ 10,346,000	$ 26,673,000
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	4,046,000	1,569,000	8,465,000
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 9,438,000	$ 8,777,000	$ 18,208,000
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	10	12	30
Total Recorded Investment Modified as TDRs During Period	$ 1,525,000	$ 3,813,000	$ 13,861,000
Commercial Financial And Agricultural [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	1,356,000	107,000	6,040,000
Commercial Financial And Agricultural [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 169,000	$ 3,706,000	$ 7,821,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	15	9	8
Total Recorded Investment Modified as TDRs During Period	$ 8,749,000	$ 3,235,000	$ 8,270,000
Commercial Real Estate Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	2,002,000		415,000
Commercial Real Estate Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 6,747,000	$ 3,235,000	$ 7,855,000
Construction Real Estate Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	1	0	3
Total Recorded Investment Modified as TDRs During Period			$ 415,000
Construction Real Estate Remaining Commercial [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period			$ 415,000
Construction Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts		1	2
Total Recorded Investment Modified as TDRs During Period		$ 26,000	$ 77,000
Construction Real Estate Mortgage [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period		$ 26,000	$ 77,000
Construction Real Estate Installment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts		1	0
Total Recorded Investment Modified as TDRs During Period		$ 14,000
Construction Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period		0	$ 0
Construction Real Estate Installment [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period		$ 14,000
Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	5	3	3
Total Recorded Investment Modified as TDRs During Period	$ 669,000	$ 156,000	$ 100,000
Residential Real Estate Commercial [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	95,000	153,000
Residential Real Estate Commercial [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 574,000	$ 3,000	$ 100,000
Residential Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	14	27	21
Total Recorded Investment Modified as TDRs During Period	$ 542,000	$ 1,956,000	$ 1,124,000
Residential Real Estate Mortgage [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	146,000	888,000	535,000
Residential Real Estate Mortgage [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 396,000	$ 1,068,000	$ 589,000
Residential Real Estate Home Equity Line Of Credit [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	8	7	18
Total Recorded Investment Modified as TDRs During Period	$ 316,000	$ 66,000	$ 360,000
Residential Real Estate Home Equity Line Of Credit [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	211,000	14,000	126,000
Residential Real Estate Home Equity Line Of Credit [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 105,000	$ 52,000	$ 234,000
Residential Real Estate Installment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	8	18	34
Total Recorded Investment Modified as TDRs During Period	$ 120,000	$ 228,000	$ 1,075,000
Residential Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 120,000	163,000	1,047,000
Residential Real Estate Installment [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period		$ 65,000	$ 28,000
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	131	214	324
Total Recorded Investment Modified as TDRs During Period	$ 533,000	$ 852,000	$ 1,391,000
Consumer Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	116,000	218,000	225,000
Consumer Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 417,000	$ 634,000	$ 1,166,000
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	1
Total Recorded Investment Modified as TDRs During Period	$ 325,000
Finance Leases Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 325,000
Construction Real Estate Retail
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	2
Total Recorded Investment Modified as TDRs During Period	$ 705,000
Construction Real Estate Retail | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	0
Construction Real Estate Retail | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 705,000