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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | $ 7,992,753 |  | $ 7,817,128 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 7,992,753 |  | 7,817,128 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (91,758) | $ (89,785) | (87,966) | $ (87,237) | $ (86,575) | $ (83,745)
Loans and Leases Receivable, Net Amount |  | 7,900,995 |  | 7,729,162 |  |  |
Construction Real Estate Commercial [Domain] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 335,487 |  | 311,122 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 335,487 |  | 311,122 |  |  |
Residential Real Estate Commercial [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 712,510 |  | 644,418 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 712,510 |  | 644,418 |  |  |
Residential Real Estate - Mortgage [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,397,361 |  | 1,346,543 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,397,361 |  | 1,346,543 |  |  |
Residential Real Estate - HELOC [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 230,074 |  | 203,459 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 230,074 |  | 203,459 |  |  |
Residential Real Estate - Installment [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 5,882 |  | 6,013 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 5,882 |  | 6,013 |  |  |
Construction Real Estate Retail |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 98,425 |  | 101,455 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 98,425 |  | 101,455 |  |  |
Commercial Financial Agricultural less PPP and Overdrafts |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,191,148 |  | 1,268,110 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,191,148 |  |  |  |  |
Bank Overdrafts |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,056 |  | 1,475 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,056 |  | 1,475 |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance | [1] | 2,126,156 |  | 1,994,332 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 2,126,156 |  | 1,994,332 |  |  |
Financing Receivable, Allowance for Credit Loss |  | (20,515) | (20,499) | (19,571) | (18,856) | (16,855) | (16,374)
Consumer less GFSC and Check Loans |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,860,866 |  | 1,908,473 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,860,866 |  | 1,908,473 |  |  |
Check loans |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 1,810 |  | 1,899 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 1,810 |  | 1,899 |  |  |
Finance Leases Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |
Loan balance |  | 31,978 |  | 29,829 |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss |  | 31,978 |  | 29,829 |  |  |
Financing Receivable, Allowance for Credit Loss |  | $ (256) | $ (192) | $ (151) | $ (165) | $ (161) | $ (117)
[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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