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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 116,180	$ 74,478	$ 116,180	$ 74,478	$ 77,491
Average recorded investment	96,028	57,236	86,828	52,490
Interest income recognized	756	412	2,139	1,142
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	33,098	31,485	33,098	31,485
Average recorded investment	29,481	23,468	30,426	18,368
Interest income recognized	159	107	543	244
Construction Real Estate Commercial [Domain]
Financing Receivable, Impaired [Line Items]
Recorded investment	3,142	1,868	3,142	1,868
Average recorded investment	1,212	1,922	743	2,176
Interest income recognized	6	1	14	23
Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	4,897	2,238	4,897	2,238
Average recorded investment	5,061	1,977	4,271	2,198
Interest income recognized	65	27	166	72
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	72,519	38,799	72,519	38,799
Average recorded investment	58,195	29,779	50,479	29,712
Interest income recognized	526	277	1,416	803
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	2,524	88	2,524	88
Average recorded investment	$ 2,079	$ 90	$ 909	$ 36