Loans (Summary Of Impaired Financial Receivables (Analysis Of Covered Impaired Loans)) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Covered Loan
Unpaid Contractual Principal Balance	$ 239,122	$ 272,384	$ 244,344
Recorded Investment With No Allowance	166,067	144,857	179,883
Recorded Investment With Allowance
Total impaired loans	166,067	144,857	179,883
Related Allowance
Average Recorded Investment	178,130	119,950	138,950
Covered Loan | Commercial, financial & agricultural
Unpaid Contractual Principal Balance	22,616	23,421	21,352
Recorded Investment With No Allowance	13,464	11,866	12,027
Recorded Investment With Allowance
Total impaired loans	13,464	11,866	12,027
Related Allowance
Average Recorded Investment	13,250	8,943	10,210
Covered Loan | Real estate - construction & development
Unpaid Contractual Principal Balance	46,439	75,282	47,005
Recorded Investment With No Allowance	30,586	31,131	34,363
Recorded Investment With Allowance
Total impaired loans	30,586	31,131	34,363
Related Allowance
Average Recorded Investment	34,260	28,435	30,610
Covered Loan | Real estate - commercial and farmland
Unpaid Contractual Principal Balance	110,388	101,453	106,953
Recorded Investment With No Allowance	81,330	57,422	84,740
Recorded Investment With Allowance
Total impaired loans	81,330	57,422	84,740
Related Allowance
Average Recorded Investment	85,639	44,234	56,607
Covered Loan | Real estate - residential
Unpaid Contractual Principal Balance	58,645	71,421	68,411
Recorded Investment With No Allowance	40,033	43,733	48,280
Recorded Investment With Allowance
Total impaired loans	40,033	43,733	48,280
Related Allowance
Average Recorded Investment	44,393	37,233	40,675
Covered Loan | Consumer installment loans
Unpaid Contractual Principal Balance	1,034	807	623
Recorded Investment With No Allowance	654	705	473
Recorded Investment With Allowance
Total impaired loans	654	705	473
Related Allowance
Average Recorded Investment	588	1,105	848
Non-Covered Loans
Unpaid Contractual Principal Balance	87,586	103,086	106,538
Recorded Investment With No Allowance
Recorded Investment With Allowance	67,391	66,973	88,774
Total impaired loans	67,391	66,973	88,774
Related Allowance	7,136	15,328	18,478
Average Recorded Investment	78,432	76,136	88,320
Non-Covered Loans | Commercial, financial & agricultural
Unpaid Contractual Principal Balance	8,116	9,229	9,592
Recorded Investment With Allowance	4,968	3,853	5,110
Total impaired loans	4,968	3,853	5,110
Related Allowance	692	1,586	1,366
Average Recorded Investment	4,936	4,391	5,700
Non-Covered Loans | Real estate - construction & development
Unpaid Contractual Principal Balance	18,805	26,562	21,893
Recorded Investment With Allowance	10,184	12,198	15,672
Total impaired loans	10,184	12,198	15,672
Related Allowance	1,070	3,695	4,053
Average Recorded Investment	12,611	16,113	18,667
Non-Covered Loans | Real estate - commercial and farmland
Unpaid Contractual Principal Balance	32,265	42,445	48,688
Recorded Investment With Allowance	27,021	33,045	45,006
Total impaired loans	27,021	33,045	45,006
Related Allowance	2,081	5,096	8,331
Average Recorded Investment	37,111	38,738	42,192
Non-Covered Loans | Real estate - residential
Unpaid Contractual Principal Balance	27,069	24,118	25,309
Recorded Investment With Allowance	24,014	17,456	22,053
Total impaired loans	24,014	17,456	22,053
Related Allowance	3,254	4,810	4,499
Average Recorded Investment	22,637	16,451	21,081
Non-Covered Loans | Consumer installment loans
Unpaid Contractual Principal Balance	1,331	732	1,056
Recorded Investment With Allowance	1,204	421	933
Total impaired loans	1,204	421	933
Related Allowance	39	141	229
Average Recorded Investment	$ 1,137	$ 443	$ 680