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Loans Schedule of average recorded investment and interest income recognized on loans individually evaluated for impairment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | $ 78,341 | $ 74,502 | $ 108,455
Impaired Financing Receivable, Average Recorded Investment |  |  | 92,294
Impaired Financing Receivable, Interest Income, Cash Basis Method | 1,795 | 2,770 | 2,879
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 28,836
Impaired Financing Receivable, Average Recorded Investment |  |  | 30,280
Impaired Financing Receivable, Interest Income, Cash Basis Method |  |  | 735
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 70,357
Impaired Financing Receivable, Average Recorded Investment |  |  | 55,279
Impaired Financing Receivable, Interest Income, Cash Basis Method |  |  | 1,890
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 3,110
Impaired Financing Receivable, Average Recorded Investment |  |  | 1,291
Impaired Financing Receivable, Interest Income, Cash Basis Method | 32 | 39 | 50
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 4,557
Impaired Financing Receivable, Average Recorded Investment |  |  | 4,329
Impaired Financing Receivable, Interest Income, Cash Basis Method | 88 | 204 | 204
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 1,595
Impaired Financing Receivable, Average Recorded Investment |  |  | $ 1,115
Impaired Financing Receivable, Interest Income, Cash Basis Method | $ 33 | $ 73 |

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524 + Details
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