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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | $ 77,491 | $ 48,144 | $ 56,564
Impaired Financing Receivable, Average Recorded Investment | 57,768 | 51,041 | 67,070
Impaired Financing Receivable, Interest Income, Cash Basis Method | 1,893 | 1,890 | 2,708
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 33,088 | 15,120 | 18,039
Impaired Financing Receivable, Average Recorded Investment | 21,415 | 21,000 | 23,154
Impaired Financing Receivable, Interest Income, Cash Basis Method | 527 | 695 | 963
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 41,791 | 28,426 | 18,142
Impaired Financing Receivable, Average Recorded Investment | 32,132 | 23,024 | 21,692
Impaired Financing Receivable, Interest Income, Cash Basis Method | 1,241 | 1,047 | 903
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 453 | 1,866 | 1,324
Impaired Financing Receivable, Average Recorded Investment | 1,987 | 1,709 | 1,729
Impaired Financing Receivable, Interest Income, Cash Basis Method | 26 | 34 | 64
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 2,025 | 2,732 | 19,059
Impaired Financing Receivable, Average Recorded Investment | 2,175 | 5,308 | 20,490
Impaired Financing Receivable, Interest Income, Cash Basis Method | 99 | $ 114 | 778
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment |  |  | $ 5
Leases |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 134 |  |
Impaired Financing Receivable, Average Recorded Investment | $ 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=118936363&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=118936363&loc=d3e5258-111524 + Details
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