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Allowance For Credit Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 85,675	$ 56,679
Financing Receivable, Allowance for Credit Loss, Writeoff	1,701	2,685
Financing Receivable, Allowance for Credit Loss, Recovery	1,677	2,356
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	24	329
Provision for Loan, Lease, and Other Losses	(4,855)	5,153
Ending balance	86,886	61,503
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	25,608	20,203
Financing Receivable, Allowance for Credit Loss, Writeoff	146	523
Financing Receivable, Allowance for Credit Loss, Recovery	123	700
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	23	(177)
Provision for Loan, Lease, and Other Losses	(1,049)	1,164
Ending balance	16,279	21,544
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	23,480	10,229
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	86	300
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(86)	(300)
Provision for Loan, Lease, and Other Losses	(1,198)	1,062
Ending balance	24,487	11,591
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	7,288	5,311
Financing Receivable, Allowance for Credit Loss, Writeoff	0	6
Financing Receivable, Allowance for Credit Loss, Recovery	252	230
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(252)	(224)
Provision for Loan, Lease, and Other Losses	171	(42)
Ending balance	5,813	5,493
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	11,363	8,610
Financing Receivable, Allowance for Credit Loss, Writeoff	11	71
Financing Receivable, Allowance for Credit Loss, Recovery	62	96
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	(51)	(25)
Provision for Loan, Lease, and Other Losses	(498)	382
Ending balance	14,037	9,017
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	17,418	12,211
Financing Receivable, Allowance for Credit Loss, Writeoff	1,544	2,085
Financing Receivable, Allowance for Credit Loss, Recovery	1,154	1,030
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	390	1,055
Provision for Loan, Lease, and Other Losses	(2,224)	2,572
Ending balance	25,729	13,728
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	518	115
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	0	0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total	0	0
Provision for Loan, Lease, and Other Losses	(57)	15
Ending balance	541	$ 130
Finance Leases Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 80

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
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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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- Definition

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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