Allowance For Credit Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 78,861	$ 86,886	$ 83,197	$ 85,675
Financing Receivable, Allowance for Credit Loss, Writeoff	2,402	1,070	3,749	2,771
Financing Receivable, Allowance for Credit Loss, Recovery	1,998	1,801	3,614	3,478
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	404	(731)	135	(707)
Provision for Loan, Lease, and Other Losses	2,991	(4,040)	(1,614)	(8,895)
Ending balance	81,448	83,577	81,448	83,577
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				6,090
Commercial Financial And Agricultural [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,288	16,279	14,025	25,608
Financing Receivable, Allowance for Credit Loss, Writeoff	723	308	913	454
Financing Receivable, Allowance for Credit Loss, Recovery	316	232	434	355
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	407	76	479	99
Provision for Loan, Lease, and Other Losses	(134)	(981)	(799)	(2,030)
Ending balance	12,747	15,222	12,747	15,222
Commercial Financial And Agricultural [Member] | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				(8,257)
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	23,731	24,487	25,466	23,480
Financing Receivable, Allowance for Credit Loss, Writeoff	598	0	598	0
Financing Receivable, Allowance for Credit Loss, Recovery	540	210	588	296
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	58	(210)	10	(296)
Provision for Loan, Lease, and Other Losses	(1,334)	(1,948)	(3,117)	(3,146)
Ending balance	22,339	22,749	22,339	22,749
Commercial Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				2,119
Construction Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,230	5,813	5,758	7,288
Financing Receivable, Allowance for Credit Loss, Writeoff	33	0	33	0
Financing Receivable, Allowance for Credit Loss, Recovery	29	229	530	481
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	4	(229)	(497)	(481)
Provision for Loan, Lease, and Other Losses	165	(372)	(1,864)	(201)
Ending balance	4,391	5,670	4,391	5,670
Construction Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				(1,898)
Residential Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,584	14,037	11,424	11,363
Financing Receivable, Allowance for Credit Loss, Writeoff	46	26	81	37
Financing Receivable, Allowance for Credit Loss, Recovery	54	68	86	130
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(8)	(42)	(5)	(93)
Provision for Loan, Lease, and Other Losses	2,027	(966)	2,190	(1,464)
Ending balance	13,619	13,113	13,619	13,113
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,121
Consumer [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	25,797	25,729	26,286	17,418
Financing Receivable, Allowance for Credit Loss, Writeoff	1,002	736	2,118	2,280
Financing Receivable, Allowance for Credit Loss, Recovery	1,058	1,062	1,975	2,216
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(56)	(326)	143	64
Provision for Loan, Lease, and Other Losses	2,296	206	2,006	(2,018)
Ending balance	28,149	26,261	28,149	26,261
Consumer [Member] | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				10,925
Finance Leases Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	231	541	238	518
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0	6	0
Financing Receivable, Allowance for Credit Loss, Recovery	1	0	1	0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(1)	0	5	0
Provision for Loan, Lease, and Other Losses	(29)	21	(30)	(36)
Ending balance	$ 203	$ 562	$ 203	562
Finance Leases Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 80