Loans (Schedule Of Allowances For Loan Losses By Portfolio Segment) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Beginning balance	$ 35,156	$ 34,576	$ 34,576
Provision for loan losses	(18,670)	(14,554)	(30,341)
Loans charged off	(28,075)	(15,626)	(31,623)
Recoveries of loans previously charged off	447	1,019	1,862
Ending balance	26,198	34,523	35,156
Loans Receivable
Beginning balance	35,156	34,576	34,576
Provision for loan losses	18,670	14,554	30,341
Loans charged off	(28,075)	(15,626)	(31,623)
Recoveries of loans previously charged off	447	1,019	1,862
Ending balance	26,198	34,523	35,156
Period-end amount allocated to:
Individually evaluated for impairment	6,632	12,193	15,966
Loans collectively evaluated for impairment	19,566	22,330	19,190
Ending balance	26,198	34,523	35,156
Loans:
Individually evaluated for impairment	53,891	70,170	77,573
Collectively evaluated for impairment	1,311,598	1,289,893	1,254,513
Ending balance	1,365,489	1,360,063	1,332,086
Commercial, financial & agricultural | Loans Receivable
Beginning balance	2,918	2,779	2,779
Provision for loan losses	425	3,234	5,772
Loans charged off	(654)	(3,241)	(5,807)
Recoveries of loans previously charged off	78	68	174
Ending balance	2,767	2,840	2,918
Commercial, financial & agricultural | Period-end amount allocated to:
Individually evaluated for impairment	623	949	766
Loans collectively evaluated for impairment	2,144	1,891	2,152
Ending balance	2,767	2,840	2,918
Commercial, financial & agricultural | Loans:
Individually evaluated for impairment	2,776	3,509	2,831
Collectively evaluated for impairment	172,127	146,868	140,129
Ending balance	174,903	150,377	142,960
Real estate - construction & development | Loans Receivable
Beginning balance	9,438	7,705	7,705
Provision for loan losses	1,795	3,683	11,354
Loans charged off	(5,211)	(5,247)	(10,988)
Recoveries of loans previously charged off	19	829	1,367
Ending balance	6,041	6,970	9,438
Real estate - construction & development | Period-end amount allocated to:
Individually evaluated for impairment	898	2,680	3,478
Loans collectively evaluated for impairment	5,143	4,290	5,960
Ending balance	6,041	6,970	9,438
Real estate - construction & development | Loans:
Individually evaluated for impairment	7,173	12,110	13,561
Collectively evaluated for impairment	117,383	131,574	116,709
Ending balance	124,556	143,684	130,270
Real estate - commercial and farmland | Loans Receivable
Beginning balance	14,226	14,971	14,971
Provision for loan losses	11,153	4,908	7,883
Loans charged off	(17,484)	(4,889)	(8,680)
Recoveries of loans previously charged off	24	6	52
Ending balance	7,919	14,996	14,226
Real estate - commercial and farmland | Period-end amount allocated to:
Individually evaluated for impairment	1,999	5,383	8,152
Loans collectively evaluated for impairment	5,920	9,613	6,074
Ending balance	7,919	14,996	14,226
Real estate - commercial and farmland | Loans:
Individually evaluated for impairment	24,838	39,289	45,084
Collectively evaluated for impairment	650,566	641,939	627,681
Ending balance	675,404	681,228	672,765
Real estate - residential | Loans Receivable
Beginning balance	8,128	8,664	8,664
Provision for loan losses	3,751	2,466	4,717
Loans charged off	(4,374)	(1,944)	(5,399)
Recoveries of loans previously charged off	162	59	146
Ending balance	7,667	9,245	8,128
Real estate - residential | Period-end amount allocated to:
Individually evaluated for impairment	3,109	3,165	3,567
Loans collectively evaluated for impairment	4,558	6,080	4,561
Ending balance	7,667	9,245	8,128
Real estate - residential | Loans:
Individually evaluated for impairment	19,088	15,199	16,080
Collectively evaluated for impairment	313,036	321,286	314,647
Ending balance	332,124	336,485	330,727
Consumer Installment and Other | Loans Receivable
Beginning balance	446	457	457
Provision for loan losses	1,546	263	615
Loans charged off	(352)	(305)	(749)
Recoveries of loans previously charged off	164	57	123
Ending balance	1,804	472	446
Consumer Installment and Other | Period-end amount allocated to:
Individually evaluated for impairment	3	16	3
Loans collectively evaluated for impairment	1,801	456	443
Ending balance	1,804	472	446
Consumer Installment and Other | Loans:
Individually evaluated for impairment	16	63	17
Collectively evaluated for impairment	58,486	48,226	55,347
Ending balance	$ 58,502	$ 48,289	$ 55,364