Loans (Summary Of Credit Quality Indicate Financial Receivable (Covered Loan Portfolio)) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Loans portfolio by risk grad	$ 1,365,489	$ 1,332,086	$ 1,360,063
Covered Loan
Loans portfolio by risk grad	601,737	571,489	486,489
Loans portfolio by risk grad	239,122	244,344	272,384
Covered Loan | 10
Loans portfolio by risk grad	1,450	2,539
Loans portfolio by risk grad			1,157
Covered Loan | 15
Loans portfolio by risk grad	2,449	2,436
Loans portfolio by risk grad			1,262
Covered Loan | 20
Loans portfolio by risk grad	97,985	56,672
Loans portfolio by risk grad			63,875
Covered Loan | 23
Loans portfolio by risk grad	7,237	5,477
Loans portfolio by risk grad			2,287
Covered Loan | 25
Loans portfolio by risk grad	223,753	219,568
Loans portfolio by risk grad			168,682
Covered Loan | 30
Loans portfolio by risk grad	63,655	78,724
Loans portfolio by risk grad			54,804
Covered Loan | 40
Loans portfolio by risk grad	205,092	206,045
Loans portfolio by risk grad			193,854
Covered Loan | 50
Loans portfolio by risk grad	116	28
Loans portfolio by risk grad			568
Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Commercial, financial & agricultural
Loans portfolio by risk grad	174,903	142,960	150,377
Commercial, financial & agricultural | Covered Loan
Loans portfolio by risk grad	41,372	41,867	42,494
Loans portfolio by risk grad	22,616	21,352	23,421
Commercial, financial & agricultural | Covered Loan | 10
Loans portfolio by risk grad	172	442
Loans portfolio by risk grad			614
Commercial, financial & agricultural | Covered Loan | 15
Loans portfolio by risk grad	115	29
Loans portfolio by risk grad			63
Commercial, financial & agricultural | Covered Loan | 20
Loans portfolio by risk grad	5,963	4,807
Loans portfolio by risk grad			7,872
Commercial, financial & agricultural | Covered Loan | 23
Loans portfolio by risk grad	11
Loans portfolio by risk grad			280
Commercial, financial & agricultural | Covered Loan | 25
Loans portfolio by risk grad	13,545	15,531
Loans portfolio by risk grad			13,860
Commercial, financial & agricultural | Covered Loan | 30
Loans portfolio by risk grad	4,544	5,882
Loans portfolio by risk grad			4,351
Commercial, financial & agricultural | Covered Loan | 40
Loans portfolio by risk grad	17,017	15,176
Loans portfolio by risk grad			15,250
Commercial, financial & agricultural | Covered Loan | 50
Loans portfolio by risk grad	5
Loans portfolio by risk grad			204
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	124,556	130,270	143,684
Real estate - construction & development | Covered Loan
Loans portfolio by risk grad	83,991	77,077	79,540
Loans portfolio by risk grad	46,439	47,005	75,282
Real estate - construction & development | Covered Loan | 10
Loans portfolio by risk grad	9
Real estate - construction & development | Covered Loan | 15
Loans portfolio by risk grad	47	52
Loans portfolio by risk grad			53
Real estate - construction & development | Covered Loan | 20
Loans portfolio by risk grad	15,440	5,751
Loans portfolio by risk grad			6,240
Real estate - construction & development | Covered Loan | 23
Loans portfolio by risk grad	1,602	1,177
Loans portfolio by risk grad			105
Real estate - construction & development | Covered Loan | 25
Loans portfolio by risk grad	19,814	21,142
Loans portfolio by risk grad			20,458
Real estate - construction & development | Covered Loan | 30
Loans portfolio by risk grad	9,843	10,654
Loans portfolio by risk grad			11,425
Real estate - construction & development | Covered Loan | 40
Loans portfolio by risk grad	37,236	38,273
Loans portfolio by risk grad			41,259
Real estate - construction & development | Covered Loan | 50
Loans portfolio by risk grad		28
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	675,404	672,765	681,228
Real estate - commercial and farmland | Covered Loan
Loans portfolio by risk grad	322,393	321,257	229,924
Loans portfolio by risk grad	110,388	106,953	101,453
Real estate - commercial and farmland | Covered Loan | 15
Loans portfolio by risk grad	1,717	1,755
Loans portfolio by risk grad			650
Real estate - commercial and farmland | Covered Loan | 20
Loans portfolio by risk grad	37,729	26,211
Loans portfolio by risk grad			28,951
Real estate - commercial and farmland | Covered Loan | 23
Loans portfolio by risk grad	3,784	3,262
Loans portfolio by risk grad			1,047
Real estate - commercial and farmland | Covered Loan | 25
Loans portfolio by risk grad	139,886	137,981
Loans portfolio by risk grad			83,901
Real estate - commercial and farmland | Covered Loan | 30
Loans portfolio by risk grad	38,306	49,642
Loans portfolio by risk grad			29,231
Real estate - commercial and farmland | Covered Loan | 40
Loans portfolio by risk grad	100,971	102,406
Loans portfolio by risk grad			86,144
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	332,124	330,727	336,485
Real estate - residential | Covered Loan
Loans portfolio by risk grad	150,683	127,644	129,721
Loans portfolio by risk grad	58,645	68,411	71,421
Real estate - residential | Covered Loan | 10
Loans portfolio by risk grad	857	1,329
Real estate - residential | Covered Loan | 15
Loans portfolio by risk grad	560	586
Loans portfolio by risk grad			476
Real estate - residential | Covered Loan | 20
Loans portfolio by risk grad	38,108	19,216
Loans portfolio by risk grad			19,630
Real estate - residential | Covered Loan | 23
Loans portfolio by risk grad	1,840	1,038
Loans portfolio by risk grad			855
Real estate - residential | Covered Loan | 25
Loans portfolio by risk grad	49,254	43,606
Loans portfolio by risk grad			48,744
Real estate - residential | Covered Loan | 30
Loans portfolio by risk grad	10,873	12,374
Loans portfolio by risk grad			9,540
Real estate - residential | Covered Loan | 40
Loans portfolio by risk grad	49,080	49,495
Loans portfolio by risk grad			50,112
Real estate - residential | Covered Loan | 50
Loans portfolio by risk grad	111
Loans portfolio by risk grad			364
Real estate - residential | Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Consumer installment loans
Loans portfolio by risk grad	41,431	37,296	35,584
Consumer installment loans | Covered Loan
Loans portfolio by risk grad	3,298	3,644	4,810
Loans portfolio by risk grad	1,034	623	807
Consumer installment loans | Covered Loan | 10
Loans portfolio by risk grad	412	768
Loans portfolio by risk grad			543
Consumer installment loans | Covered Loan | 15
Loans portfolio by risk grad	10	14
Loans portfolio by risk grad			20
Consumer installment loans | Covered Loan | 20
Loans portfolio by risk grad	745	687
Loans portfolio by risk grad			1,182
Consumer installment loans | Covered Loan | 25
Loans portfolio by risk grad	1,254	1,308
Loans portfolio by risk grad			1,719
Consumer installment loans | Covered Loan | 30
Loans portfolio by risk grad	89	172
Loans portfolio by risk grad			257
Consumer installment loans | Covered Loan | 40
Loans portfolio by risk grad	788	695
Loans portfolio by risk grad			1,089
Consumer installment loans | Covered Loan | 60
Loans portfolio by risk grad
Loans portfolio by risk grad
Other Loans
Loans portfolio by risk grad	17,071	18,068	12,705
Other Loans | Covered Loan
Loans portfolio by risk grad
Other Loans | Covered Loan | 10
Loans portfolio by risk grad
Other Loans | Covered Loan | 15
Loans portfolio by risk grad
Other Loans | Covered Loan | 20
Loans portfolio by risk grad
Other Loans | Covered Loan | 23
Loans portfolio by risk grad
Other Loans | Covered Loan | 25
Loans portfolio by risk grad
Other Loans | Covered Loan | 30
Loans portfolio by risk grad
Other Loans | Covered Loan | 40
Loans portfolio by risk grad
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