Loans Schedule of troubled debt restructurings on financing receivables (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) contracts	Dec. 31, 2021 USD ($) contracts	Dec. 31, 2020 USD ($) contracts
Financing Receivable, Impaired [Line Items]
Troubled Debt Restructuring, Classification removed	$ 1,000,000	$ 4,100,000
TDRs included in nonaccrual loan totals	17,500,000	20,900,000
Nonaccrual TDRs considered current	7,500,000	10,500,000
TDRs included in accruing loan totals	20,100,000	28,300,000
Loans and Leases Receivable, Impaired, Commitment to Lend	1,600,000	3,000,000
Specific Reserves Related To Troubled Debt Restructuring	2,200,000	300,000
Additional specific reserves related to troubled debt restructuring	900,000	200,000	$ 7,000
Modified substandard commercial loans, total recorded investment	29,600,000	200,000
Modified substandard consumer loans total recorded investment	41,700,000	32,900,000
Nonaccrual loans not classified as TDRs at prior fiscal year end	$ 1,000,000	$ 5,400,000	$ 400,000
Financing Receivable, Modifications, Number of Contracts | contracts	156	195	292
Total Recorded Investment Modified as TDRs During Period	$ 9,995,000	$ 13,484,000	$ 10,346,000
Commercial Financial Agricultural less PPP and Overdrafts
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	12	10
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification	$ 5,738,000	$ 1,525,000
GFSC loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	0	0
Check Loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	0	0
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 4,517,000	$ 4,046,000	1,569,000
Accruing Financing Receivable Modifications [Member] | Commercial Financial Agricultural less PPP and Overdrafts
Financing Receivable, Impaired [Line Items]
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification	2,254,000	1,356,000
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	5,478,000	9,438,000	$ 8,777,000
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial Agricultural less PPP and Overdrafts
Financing Receivable, Impaired [Line Items]
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification	$ 3,484,000	$ 169,000
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts			12
Total Recorded Investment Modified as TDRs During Period			$ 3,813,000
Commercial Financial And Agricultural [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period			107,000
Commercial Financial And Agricultural [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period			$ 3,706,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	9	15	9
Total Recorded Investment Modified as TDRs During Period	$ 1,853,000	$ 8,749,000	$ 3,235,000
Commercial Real Estate Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	1,040,000	2,002,000
Commercial Real Estate Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 813,000	$ 6,747,000	$ 3,235,000
Construction Real Estate Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	1	1	0
Total Recorded Investment Modified as TDRs During Period	$ 41,000
Construction Real Estate Remaining Commercial [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 41,000
Construction Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts			1
Total Recorded Investment Modified as TDRs During Period			$ 26,000
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
Construction Real Estate Installment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts			1
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
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	4	5	3
Total Recorded Investment Modified as TDRs During Period	$ 295,000	$ 669,000	$ 156,000
Residential Real Estate Commercial [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	21,000	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	$ 274,000	$ 574,000	$ 3,000
Residential Real Estate Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	15	14	27
Total Recorded Investment Modified as TDRs During Period	$ 1,233,000	$ 542,000	$ 1,956,000
Residential Real Estate Mortgage [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	865,000	146,000	888,000
Residential Real Estate Mortgage [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 368,000	$ 396,000	$ 1,068,000
Residential Real Estate Home Equity Line Of Credit [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	3	8	7
Total Recorded Investment Modified as TDRs During Period	$ 11,000	$ 316,000	$ 66,000
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	0	211,000	14,000
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	$ 11,000	$ 105,000	$ 52,000
Residential Real Estate Installment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	12	8	18
Total Recorded Investment Modified as TDRs During Period	$ 168,000	$ 120,000	$ 228,000
Residential Real Estate Installment [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	141,000	$ 120,000	163,000
Residential Real Estate Installment [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 27,000		$ 65,000
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	10	1
Total Recorded Investment Modified as TDRs During Period	$ 101,000	$ 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	$ 101,000	$ 325,000
Construction Real Estate Retail
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	1	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	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
PPP loans receivable
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	0	0
Bank Overdrafts
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	0	0
consumer less GFSC and check loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	89	131
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification	$ 555,000	$ 533,000
consumer less GFSC and check loans | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification	196,000	116,000
consumer less GFSC and check loans | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification	$ 359,000	$ 417,000
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts			214
Total Recorded Investment Modified as TDRs During Period			$ 852,000
Consumer Portfolio Segment [Member] | Accruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period			218,000
Consumer Portfolio Segment [Member] | Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment Modified as TDRs During Period			$ 634,000