Loans (Summary Of Past Due Financial Receivables (Non-Covered)) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Loans 30-59 Days Past Due	$ 23,500		$ 27,000
Total Loans	1,439,862	1,332,086	1,368,895
Non-Covered Loans
Loans 30-59 Days Past Due	13,104	16,376	14,696
Loans 60-89 Days Past Due	4,233	14,583	7,973
Loans 90 or More Days Past Due	36,733	64,135	55,738
Total Loans Past Due	54,070	95,094	78,407
Current Loans	1,385,792	1,236,992	1,290,488
Total Loans	1,439,862	1,332,086	1,368,895
Loans 90 Days or More Past Due and Still Accruing			20
Commercial, financial & agricultural
Total Loans	189,374	142,960	159,020
Commercial, financial & agricultural | Non-Covered Loans
Loans 30-59 Days Past Due	1,192	1,103	657
Loans 60-89 Days Past Due	639	705	884
Loans 90 or More Days Past Due	3,786	3,975	4,544
Total Loans Past Due	5,617	5,783	6,085
Current Loans	183,757	137,177	152,935
Total Loans	189,374	142,960	159,020
Real estate - construction & development
Total Loans	125,315	130,270	145,770
Real estate - construction & development | Non-Covered Loans
Loans 30-59 Days Past Due	518	2,395	1,228
Loans 60-89 Days Past Due	152	1,507	1,759
Loans 90 or More Days Past Due	8,180	13,608	15,050
Total Loans Past Due	8,850	17,510	18,037
Current Loans	116,465	112,760	127,733
Total Loans	125,315	130,270	145,770
Real estate - commercial and farmland
Total Loans	713,240	672,765	677,048
Real estate - commercial and farmland | Non-Covered Loans
Loans 30-59 Days Past Due	3,507	6,686	6,755
Loans 60-89 Days Past Due	812	7,071	2,594
Loans 90 or More Days Past Due	11,402	32,953	22,777
Total Loans Past Due	15,721	46,710	32,126
Current Loans	697,519	626,055	644,922
Total Loans	713,240	672,765	677,048
Real estate - residential
Total Loans	343,332	330,727	331,236
Real estate - residential | Non-Covered Loans
Loans 30-59 Days Past Due	7,200	5,229	5,581
Loans 60-89 Days Past Due	2,346	4,995	2,476
Loans 90 or More Days Past Due	12,372	12,874	12,706
Total Loans Past Due	21,918	23,098	20,763
Current Loans	321,414	307,629	310,473
Total Loans	343,332	330,727	331,236
Consumer installment loans
Total Loans	43,441	37,296	38,163
Consumer installment loans | Non-Covered Loans
Loans 30-59 Days Past Due	687	963	475
Loans 60-89 Days Past Due	284	305	260
Loans 90 or More Days Past Due	993	725	661
Total Loans Past Due	1,964	1,993	1,396
Current Loans	41,477	35,303	36,767
Total Loans	43,441	37,296	38,163
Loans 90 Days or More Past Due and Still Accruing			20
Other Loans
Total Loans	25,160	18,068	17,658
Other Loans | Non-Covered Loans
Current Loans	25,160	18,068	17,658
Total Loans	$ 25,160	$ 18,068	$ 17,658