Allowance For Credit Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 83,197	$ 85,675
Financing Receivable, Allowance for Credit Loss, Writeoff	1,347	1,701
Financing Receivable, Allowance for Credit Loss, Recovery	1,616	1,677
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(269)	24
Provision for Loan, Lease, and Other Losses	(4,605)	(4,855)
Ending balance	78,861	86,886
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	14,025	25,608
Financing Receivable, Allowance for Credit Loss, Writeoff	190	146
Financing Receivable, Allowance for Credit Loss, Recovery	118	123
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	72	23
Provision for Loan, Lease, and Other Losses	(665)	(1,049)
Ending balance	13,288	16,279
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	25,466	23,480
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	48	86
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(48)	(86)
Provision for Loan, Lease, and Other Losses	(1,783)	(1,198)
Ending balance	23,731	24,487
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	5,758	7,288
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	501	252
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(501)	(252)
Provision for Loan, Lease, and Other Losses	(2,029)	171
Ending balance	4,230	5,813
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	11,424	11,363
Financing Receivable, Allowance for Credit Loss, Writeoff	35	11
Financing Receivable, Allowance for Credit Loss, Recovery	32	62
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	3	(51)
Provision for Loan, Lease, and Other Losses	163	(498)
Ending balance	11,584	14,037
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	26,286	17,418
Financing Receivable, Allowance for Credit Loss, Writeoff	1,116	1,544
Financing Receivable, Allowance for Credit Loss, Recovery	917	1,154
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	199	390
Provision for Loan, Lease, and Other Losses	(290)	(2,224)
Ending balance	25,797	25,729
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	238	518
Financing Receivable, Allowance for Credit Loss, Writeoff	6	0
Financing Receivable, Allowance for Credit Loss, Recovery	0	0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	6	0
Provision for Loan, Lease, and Other Losses	(1)	(57)
Ending balance	$ 231	541
Finance Leases Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		$ 80

Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (4)

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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