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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		$ 73,144	$ 90,844	$ 73,144	$ 90,844	$ 70,426
Loan balance		5,365,437		5,365,437		5,271,857
Accrued interest receivable		19,274		19,274		18,822
Recorded Investment		5,380,032		5,380,032		5,286,830
Impaired Financing Receivable, Average Recorded Investment		67,672	81,825	67,479	80,544
Impaired Financing Receivable, Interest Income, Cash Basis Method		437	848	1,248	3,244
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		1,636	6,086	1,636	6,086
Loan balance		118,605		118,605		135,343
Accrued interest receivable		367		367		398
Recorded Investment		118,972		118,972		135,741
Impaired Financing Receivable, Average Recorded Investment		1,843	6,395	1,960	6,564
Impaired Financing Receivable, Interest Income, Cash Basis Method		16	15	31	28
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		28,475	29,779	28,475	29,779
Impaired Financing Receivable, Average Recorded Investment		23,320	28,600	21,789	29,319
Impaired Financing Receivable, Interest Income, Cash Basis Method		120	308	340	546
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		47,028		47,028		48,699
Accrued interest receivable		103		103		106
Recorded Investment		47,131		47,131		48,805
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		4,766		4,766		4,903
Accrued interest receivable		15		15		17
Recorded Investment		4,781		4,781		4,920
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		21,235	25,070	21,235	25,070
Loan balance		397,762		397,762		406,687
Accrued interest receivable		949		949		940
Recorded Investment		398,711		398,711		407,627
Impaired Financing Receivable, Average Recorded Investment		20,732	24,648	21,220	24,795
Impaired Financing Receivable, Interest Income, Cash Basis Method		61	340	406	2,305
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		1,150,606		1,150,606		1,169,495
Accrued interest receivable		1,219		1,219		1,459
Recorded Investment		1,151,825		1,151,825		1,170,954
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		209,251		209,251		212,441
Accrued interest receivable		873		873		853
Recorded Investment		210,124		210,124		213,294
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		18,948		18,948		19,874
Accrued interest receivable		52		52		67
Recorded Investment		19,000		19,000		19,941
Loans Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Accrued interest receivable		14,595		14,595		14,973
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	[1]	1,006,479		1,006,479		994,619
Accrued interest receivable	[1]	3,837		3,837		3,558
Recorded Investment	[1]	1,010,316		1,010,316		998,177
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		21,790	29,889	21,790	29,889
Loan balance	[1]	1,191,881		1,191,881		1,155,703
Accrued interest receivable	[1]	3,960		3,960		4,161
Recorded Investment	[1]	1,195,841		1,195,841		1,159,864
Impaired Financing Receivable, Average Recorded Investment		21,768	22,177	22,504	19,863
Impaired Financing Receivable, Interest Income, Cash Basis Method		240	185	471	365
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		8	20	8	20
Loan balance		1,216,764		1,216,764		1,120,850
Accrued interest receivable		3,190		3,190		3,385
Recorded Investment		1,219,954		1,219,954		1,124,235
Impaired Financing Receivable, Average Recorded Investment		9	$ 5	6	$ 3
Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		3,347		3,347		3,243
Accrued interest receivable		30		30		29
Recorded Investment		$ 3,377		$ 3,377		$ 3,272
[1] Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

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Loans and Leases Receivable, Recorded Investment

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB
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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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