Loans (Summary Of Past Due Financial Receivables (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
Covered Loan
Loans 30-59 Days Past Due	16,825	25,306	26,033
Loans 60-89 Days Past Due	12,451	15,922	13,601
Loans 90 or More Days Past Due	113,705	139,601	128,627
Total Loans Past Due	142,981	180,829	168,261
Current Loans	403,253	390,660	427,167
Total Loans	546,234	571,489	595,428
Loans 90 Days or More Past Due and Still Accruing	4,138	455	2,730
Commercial, financial & agricultural
Total Loans	189,374	142,960	159,020
Commercial, financial & agricultural | Covered Loan
Loans 30-59 Days Past Due	1,384	968	290
Loans 60-89 Days Past Due	788	4,297	411
Loans 90 or More Days Past Due	11,315	11,253	11,406
Total Loans Past Due	13,487	16,518	12,107
Current Loans	23,680	25,349	37,752
Total Loans	37,167	41,867	49,859
Loans 90 Days or More Past Due and Still Accruing			5
Real estate - construction & development
Total Loans	125,315	130,270	145,770
Real estate - construction & development | Covered Loan
Loans 30-59 Days Past Due	3,611	2,444	1,175
Loans 60-89 Days Past Due	1,663	1,318	2,610
Loans 90 or More Days Past Due	22,194	27,867	30,220
Total Loans Past Due	27,468	31,629	34,005
Current Loans	45,888	45,448	48,928
Total Loans	73,356	77,077	82,933
Loans 90 Days or More Past Due and Still Accruing	2,312		347
Real estate - commercial and farmland
Total Loans	713,240	672,765	677,048
Real estate - commercial and farmland | Covered Loan
Loans 30-59 Days Past Due	7,072	18,282	16,316
Loans 60-89 Days Past Due	6,559	8,544	7,790
Loans 90 or More Days Past Due	51,382	64,091	54,009
Total Loans Past Due	65,013	90,917	78,115
Current Loans	233,890	230,340	245,645
Total Loans	298,903	321,257	323,760
Loans 90 Days or More Past Due and Still Accruing	808	165	339
Real estate - residential
Total Loans	343,332	330,727	331,236
Real estate - residential | Covered Loan
Loans 30-59 Days Past Due	4,702	3,485	8,180
Loans 60-89 Days Past Due	3,349	1,493	2,717
Loans 90 or More Days Past Due	28,559	35,950	32,570
Total Loans Past Due	36,610	40,928	43,467
Current Loans	98,544	86,716	91,851
Total Loans	135,154	127,644	135,318
Loans 90 Days or More Past Due and Still Accruing	1,018	290	2,039
Consumer installment loans
Total Loans	43,441	37,296	38,163
Consumer installment loans | Covered Loan
Loans 30-59 Days Past Due	56	127	72
Loans 60-89 Days Past Due	92	270	73
Loans 90 or More Days Past Due	255	440	422
Total Loans Past Due	403	837	567
Current Loans	1,251	2,807	2,991
Total Loans	$ 1,654	$ 3,644	$ 3,558