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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | $ 7,208,109 |  | $ 7,141,891 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (87,206) | $ (85,946) | (85,379) | $ (81,448) | $ (78,861) | $ (83,197)
Loans and Leases Receivable, Net Amount |  | 7,120,903 |  | 7,056,512 |  |  |
Construction Real Estate Commercial [Domain] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 160,344 |  | 208,982 |  |  |
Residential Real Estate Commercial [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 580,445 |  | 550,183 |  |  |
Residential Real Estate - Mortgage [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,133,676 |  | 1,075,446 |  |  |
Residential Real Estate - HELOC [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 167,940 |  | 167,151 |  |  |
Residential Real Estate - Installment [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 4,262 |  | 4,091 |  |  |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,287,003 |  | 1,300,933 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (16,278) | (16,572) | (16,987) | (12,747) | (13,288) | (14,025)
PPP loans receivable [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 3,078 |  | 4,206 |  |  |
Bank Overdrafts |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,596 |  | 1,489 |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance | [1] | 1,799,440 |  | 1,794,054 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (19,141) | (17,946) | (17,829) | (22,339) | (23,731) | (25,466)
GFSC loans |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 65 |  | 274 |  |  |
Check loans |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 2,044 |  | 2,150 |  |  |
Finance Leases Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 18,380 |  | 19,637 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (112) | $ (124) | (161) | $ (203) | $ (231) | $ (238)
Consumer less GFSC and Check Loans |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,940,148 |  | 1,902,557 |  |  |
Commercial Financial Agricultural less PPP and Overdrafts |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | $ 1,282,329 |  | $ 1,295,238 |  |  |
[1] | Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

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