Loans (Average Recorded Investment And Interest Income Recognized On Loans Individually Evaluated For Impairment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 73,609	$ 77,998	$ 73,609	$ 77,998	$ 70,426
Average recorded investment	72,580	84,736	68,953	81,191
Interest income recognized	654	767	1,902	4,011
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	29,848	23,856	29,848	23,856
Average recorded investment	28,412	26,679	23,770	28,217
Interest income recognized	398	194	738	740
Construction Real Estate Commercial [Domain]
Financing Receivable, Impaired [Line Items]
Recorded investment	1,460	4,377	1,460	4,377
Average recorded investment	1,554	5,643	1,830	6,244
Interest income recognized	18	16	49	44
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	19,298	23,700	19,298	23,700
Average recorded investment	20,365	24,422	20,876	24,618
Interest income recognized	46	314	452	2,619
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	22,995	26,065	22,995	26,065
Average recorded investment	22,241	27,982	22,470	22,108
Interest income recognized	192	243	663	608
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	8		8
Average recorded investment	$ 8	$ 10	$ 7	$ 4