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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		$ 7,883,735	$ 7,817,128
Financing Receivable, Allowance for Credit Loss		(88,130)	(87,966)	$ (85,084)	$ (83,745)
Loans and Leases Receivable, Net Amount		7,795,605	7,729,162
Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		362,857	311,122
Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		663,220	644,418
Residential Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		1,360,827	1,346,543
Residential Real Estate - HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		209,191	203,459
Residential Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		6,032	6,013
Construction Real Estate Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		99,504	101,455
Commercial Financial Agricultural less PPP and Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		1,246,160	1,268,110
Bank Overdrafts
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		1,068	1,475
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance	[1]	2,029,349	1,994,332
Financing Receivable, Allowance for Credit Loss		(19,838)	(19,571)	(17,181)	(16,374)
Consumer less GFSC and Check Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		1,874,845	1,908,473
Check loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		1,845	1,899
Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan balance		28,837	29,829
Financing Receivable, Allowance for Credit Loss		$ (181)	$ (151)	$ (163)	$ (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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