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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | $ 108,455 | $ 77,491 | $ 48,144
Impaired Financing Receivable, Average Recorded Investment | 92,294 | 57,768 | 51,041
Impaired Financing Receivable, Interest Income, Cash Basis Method | 2,879 | 1,893 | 1,890
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 28,836 | 33,088 | 15,120
Impaired Financing Receivable, Average Recorded Investment | 30,280 | 21,415 | 21,000
Impaired Financing Receivable, Interest Income, Cash Basis Method | 735 | 527 | 695
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 70,357 | 41,791 | 28,426
Impaired Financing Receivable, Average Recorded Investment | 55,279 | 32,132 | 23,024
Impaired Financing Receivable, Interest Income, Cash Basis Method | 1,890 | 1,241 | 1,047
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 3,110 | 453 | 1,866
Impaired Financing Receivable, Average Recorded Investment | 1,291 | 1,987 | 1,709
Impaired Financing Receivable, Interest Income, Cash Basis Method | 50 | 26 | 34
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 4,557 | 2,025 | 2,732
Impaired Financing Receivable, Average Recorded Investment | 4,329 | 2,175 | 5,308
Impaired Financing Receivable, Interest Income, Cash Basis Method | 204 | 99 | $ 114
Leases |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 1,595 | 134 |
Impaired Financing Receivable, Average Recorded Investment | $ 1,115 | $ 59 |

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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 http://asc.fasb.org/extlink&oid=121611835&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 http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 + 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 http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details
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