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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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