Loans (Summary Of Credit Quality Indicate Financial Receivable (Covered Loan Portfolio)) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Loans portfolio by risk grad	$ 1,439,862	$ 1,332,086	$ 1,368,895
Covered Loan
Loans portfolio by risk grad	546,234	571,489	595,428
Loans portfolio by risk grad	206,439	244,344	340,109
Covered Loan | 10
Loans portfolio by risk grad	861	2,539
Loans portfolio by risk grad			2,541
Covered Loan | 15
Loans portfolio by risk grad	2,516	2,436
Loans portfolio by risk grad			2,532
Covered Loan | 20
Loans portfolio by risk grad	94,548	56,672
Loans portfolio by risk grad			63,623
Covered Loan | 23
Loans portfolio by risk grad	7,783	5,477
Loans portfolio by risk grad			2,222
Covered Loan | 25
Loans portfolio by risk grad	206,782	219,568
Loans portfolio by risk grad			239,373
Covered Loan | 30
Loans portfolio by risk grad	56,401	78,724
Loans portfolio by risk grad			69,223
Covered Loan | 40
Loans portfolio by risk grad	177,343	206,045
Loans portfolio by risk grad			213,828
Covered Loan | 50
Loans portfolio by risk grad		28
Loans portfolio by risk grad			2,086
Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Commercial, financial & agricultural
Loans portfolio by risk grad	189,374	142,960	159,020
Commercial, financial & agricultural | Covered Loan
Loans portfolio by risk grad	37,167	41,867	49,859
Loans portfolio by risk grad	17,833	21,352	19,904
Commercial, financial & agricultural | Covered Loan | 10
Loans portfolio by risk grad		442
Loans portfolio by risk grad			587
Commercial, financial & agricultural | Covered Loan | 15
Loans portfolio by risk grad	91	29
Loans portfolio by risk grad			31
Commercial, financial & agricultural | Covered Loan | 20
Loans portfolio by risk grad	4,970	4,807
Loans portfolio by risk grad			4,602
Commercial, financial & agricultural | Covered Loan | 23
Loans portfolio by risk grad	30
Commercial, financial & agricultural | Covered Loan | 25
Loans portfolio by risk grad	11,986	15,531
Loans portfolio by risk grad			22,142
Commercial, financial & agricultural | Covered Loan | 30
Loans portfolio by risk grad	4,063	5,882
Loans portfolio by risk grad			5,810
Commercial, financial & agricultural | Covered Loan | 40
Loans portfolio by risk grad	16,027	15,176
Loans portfolio by risk grad			16,683
Commercial, financial & agricultural | Covered Loan | 50
Loans portfolio by risk grad
Loans portfolio by risk grad			4
Commercial, financial & agricultural | Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Real estate - construction & development
Loans portfolio by risk grad	125,315	130,270	145,770
Real estate - construction & development | Covered Loan
Loans portfolio by risk grad	73,356	77,077	82,933
Loans portfolio by risk grad	34,787	47,005	111,148
Real estate - construction & development | Covered Loan | 10
Loans portfolio by risk grad	8
Real estate - construction & development | Covered Loan | 15
Loans portfolio by risk grad	44	52
Loans portfolio by risk grad			53
Real estate - construction & development | Covered Loan | 20
Loans portfolio by risk grad	13,950	5,751
Loans portfolio by risk grad			5,615
Real estate - construction & development | Covered Loan | 23
Loans portfolio by risk grad	1,226	1,177
Loans portfolio by risk grad			54
Real estate - construction & development | Covered Loan | 25
Loans portfolio by risk grad	18,921	21,142
Loans portfolio by risk grad			22,664
Real estate - construction & development | Covered Loan | 30
Loans portfolio by risk grad	7,494	10,654
Loans portfolio by risk grad			12,831
Real estate - construction & development | Covered Loan | 40
Loans portfolio by risk grad	31,713	38,273
Loans portfolio by risk grad			40,571
Real estate - construction & development | Covered Loan | 50
Loans portfolio by risk grad		28
Loans portfolio by risk grad			1,145
Real estate - construction & development | Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Real estate - commercial and farmland
Loans portfolio by risk grad	713,240	672,765	677,048
Real estate - commercial and farmland | Covered Loan
Loans portfolio by risk grad	298,903	321,257	323,760
Loans portfolio by risk grad	98,909	106,953	135,514
Real estate - commercial and farmland | Covered Loan | 15
Loans portfolio by risk grad	1,673	1,755
Loans portfolio by risk grad			1,799
Real estate - commercial and farmland | Covered Loan | 20
Loans portfolio by risk grad	40,912	26,211
Loans portfolio by risk grad			31,938
Real estate - commercial and farmland | Covered Loan | 23
Loans portfolio by risk grad	4,638	3,262
Loans portfolio by risk grad			1,478
Real estate - commercial and farmland | Covered Loan | 25
Loans portfolio by risk grad	130,155	137,981
Loans portfolio by risk grad			141,921
Real estate - commercial and farmland | Covered Loan | 30
Loans portfolio by risk grad	35,764	49,642
Loans portfolio by risk grad			41,679
Real estate - commercial and farmland | Covered Loan | 40
Loans portfolio by risk grad	85,761	102,406
Loans portfolio by risk grad			104,008
Real estate - commercial and farmland | Covered Loan | 50
Loans portfolio by risk grad
Loans portfolio by risk grad			937
Real estate - commercial and farmland | Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Real estate - residential
Loans portfolio by risk grad	343,332	330,727	331,236
Real estate - residential | Covered Loan
Loans portfolio by risk grad	135,154	127,644	135,318
Loans portfolio by risk grad	54,020	68,411	72,962
Real estate - residential | Covered Loan | 10
Loans portfolio by risk grad	853	1,329
Loans portfolio by risk grad			1,376
Real estate - residential | Covered Loan | 15
Loans portfolio by risk grad	708	586
Loans portfolio by risk grad			633
Real estate - residential | Covered Loan | 20
Loans portfolio by risk grad	34,397	19,216
Loans portfolio by risk grad			20,911
Real estate - residential | Covered Loan | 23
Loans portfolio by risk grad	1,889	1,038
Loans portfolio by risk grad			690
Real estate - residential | Covered Loan | 25
Loans portfolio by risk grad	44,999	43,606
Loans portfolio by risk grad			51,260
Real estate - residential | Covered Loan | 30
Loans portfolio by risk grad	9,016	12,374
Loans portfolio by risk grad			8,705
Real estate - residential | Covered Loan | 40
Loans portfolio by risk grad	43,292	49,495
Loans portfolio by risk grad			51,743
Real estate - residential | Covered Loan | 50
Loans portfolio by risk grad
Real estate - residential | Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Consumer installment loans
Loans portfolio by risk grad	43,441	37,296	38,163
Consumer installment loans | Covered Loan
Loans portfolio by risk grad	1,654	3,644	3,558
Loans portfolio by risk grad	890	623	581
Consumer installment loans | Covered Loan | 10
Loans portfolio by risk grad		768
Loans portfolio by risk grad			578
Consumer installment loans | Covered Loan | 15
Loans portfolio by risk grad		14
Loans portfolio by risk grad			16
Consumer installment loans | Covered Loan | 20
Loans portfolio by risk grad	319	687
Loans portfolio by risk grad			557
Consumer installment loans | Covered Loan | 25
Loans portfolio by risk grad	721	1,308
Loans portfolio by risk grad			1,386
Consumer installment loans | Covered Loan | 30
Loans portfolio by risk grad	64	172
Loans portfolio by risk grad			198
Consumer installment loans | Covered Loan | 40
Loans portfolio by risk grad	550	695
Loans portfolio by risk grad			823
Consumer installment loans | Covered Loan | 50
Loans portfolio by risk grad
Consumer installment loans | Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Other Loans
Loans portfolio by risk grad	25,160	18,068	17,658
Other Loans | Covered Loan | 50
Loans portfolio by risk grad
Other Loans | Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad