Loans (Summary Of Credit Quality Indicate Financial Receivable (Non-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
Non-Covered Loans
Loans portfolio by risk grad	1,439,862	1,332,086	1,368,895
Non-Covered Loans | 10
Loans portfolio by risk grad	34,809	23,930	23,461
Non-Covered Loans | 15
Loans portfolio by risk grad	244,466	261,489	193,881
Non-Covered Loans | 20
Loans portfolio by risk grad	592,283	485,364	550,748
Non-Covered Loans | 23
Loans portfolio by risk grad	30,176	29,730	30,538
Non-Covered Loans | 25
Loans portfolio by risk grad	427,598	386,365	425,142
Non-Covered Loans | 30
Loans portfolio by risk grad	35,478	41,584	52,760
Non-Covered Loans | 40
Loans portfolio by risk grad	74,606	102,947	91,857
Non-Covered Loans | 50
Loans portfolio by risk grad	446	677	508
Non-Covered Loans | 60
Loans portfolio by risk grad
Commercial, financial & agricultural
Loans portfolio by risk grad	189,374	142,960	159,020
Commercial, financial & agricultural | Non-Covered Loans
Loans portfolio by risk grad	189,374	142,960	159,020
Commercial, financial & agricultural | Non-Covered Loans | 10
Loans portfolio by risk grad	26,291	17,213	16,047
Commercial, financial & agricultural | Non-Covered Loans | 15
Loans portfolio by risk grad	11,816	15,379	12,135
Commercial, financial & agricultural | Non-Covered Loans | 20
Loans portfolio by risk grad	80,681	60,631	67,085
Commercial, financial & agricultural | Non-Covered Loans | 23
Loans portfolio by risk grad	5	32	1,192
Commercial, financial & agricultural | Non-Covered Loans | 25
Loans portfolio by risk grad	62,377	42,815	55,307
Commercial, financial & agricultural | Non-Covered Loans | 30
Loans portfolio by risk grad	1,508	2,509	1,738
Commercial, financial & agricultural | Non-Covered Loans | 40
Loans portfolio by risk grad	6,436	4,258	5,376
Commercial, financial & agricultural | Non-Covered Loans | 50
Loans portfolio by risk grad	260	123	140
Commercial, financial & agricultural | Non-Covered Loans | 60
Loans portfolio by risk grad
Real estate - construction & development
Loans portfolio by risk grad	125,315	130,270	145,770
Real estate - construction & development | Non-Covered Loans
Loans portfolio by risk grad	125,315	130,270	145,770
Real estate - construction & development | Non-Covered Loans | 10
Loans portfolio by risk grad		20	211
Real estate - construction & development | Non-Covered Loans | 15
Loans portfolio by risk grad	4,532	5,391	4,814
Real estate - construction & development | Non-Covered Loans | 20
Loans portfolio by risk grad	33,603	32,654	35,764
Real estate - construction & development | Non-Covered Loans | 23
Loans portfolio by risk grad	7,667	7,994	8,043
Real estate - construction & development | Non-Covered Loans | 25
Loans portfolio by risk grad	59,013	62,029	69,618
Real estate - construction & development | Non-Covered Loans | 30
Loans portfolio by risk grad	7,948	2,027	4,291
Real estate - construction & development | Non-Covered Loans | 40
Loans portfolio by risk grad	12,396	19,864	22,753
Real estate - construction & development | Non-Covered Loans | 50
Loans portfolio by risk grad	156	291	276
Real estate - construction & development | Non-Covered Loans | 60
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 | Non-Covered Loans
Loans portfolio by risk grad	713,240	672,765	677,048
Real estate - commercial and farmland | Non-Covered Loans | 10
Loans portfolio by risk grad	220	235	905
Real estate - commercial and farmland | Non-Covered Loans | 15
Loans portfolio by risk grad	152,678	151,068	146,029
Real estate - commercial and farmland | Non-Covered Loans | 20
Loans portfolio by risk grad	324,270	272,241	277,651
Real estate - commercial and farmland | Non-Covered Loans | 23
Loans portfolio by risk grad	8,773	10,679	9,290
Real estate - commercial and farmland | Non-Covered Loans | 25
Loans portfolio by risk grad	184,146	163,554	169,887
Real estate - commercial and farmland | Non-Covered Loans | 30
Loans portfolio by risk grad	14,742	21,490	35,550
Real estate - commercial and farmland | Non-Covered Loans | 40
Loans portfolio by risk grad	28,411	53,498	37,736
Real estate - commercial and farmland | Non-Covered Loans | 60
Loans portfolio by risk grad
Real estate - residential
Loans portfolio by risk grad	343,332	330,727	331,236
Real estate - residential | Non-Covered Loans
Loans portfolio by risk grad	343,332	330,727	331,236
Real estate - residential | Non-Covered Loans | 10
Loans portfolio by risk grad	411	252	109
Real estate - residential | Non-Covered Loans | 15
Loans portfolio by risk grad	74,040	88,586	29,930
Real estate - residential | Non-Covered Loans | 20
Loans portfolio by risk grad	105,531	80,989	130,731
Real estate - residential | Non-Covered Loans | 23
Loans portfolio by risk grad	13,650	10,997	11,985
Real estate - residential | Non-Covered Loans | 25
Loans portfolio by risk grad	113,560	110,786	122,939
Real estate - residential | Non-Covered Loans | 30
Loans portfolio by risk grad	10,535	15,001	10,583
Real estate - residential | Non-Covered Loans | 40
Loans portfolio by risk grad	25,583	23,867	24,959
Real estate - residential | Non-Covered Loans | 50
Loans portfolio by risk grad	22	249
Real estate - residential | Non-Covered Loans | 60
Loans portfolio by risk grad
Consumer installment loans
Loans portfolio by risk grad	43,441	37,296	38,163
Consumer installment loans | Non-Covered Loans
Loans portfolio by risk grad	43,441	37,296	38,163
Consumer installment loans | Non-Covered Loans | 10
Loans portfolio by risk grad	7,887	6,210	6,189
Consumer installment loans | Non-Covered Loans | 15
Loans portfolio by risk grad	1,400	1,065	973
Consumer installment loans | Non-Covered Loans | 20
Loans portfolio by risk grad	23,038	20,781	21,859
Consumer installment loans | Non-Covered Loans | 23
Loans portfolio by risk grad	81	28	28
Consumer installment loans | Non-Covered Loans | 25
Loans portfolio by risk grad	8,502	7,181	7,391
Consumer installment loans | Non-Covered Loans | 30
Loans portfolio by risk grad	745	557	598
Consumer installment loans | Non-Covered Loans | 40
Loans portfolio by risk grad	1,780	1,460	1,033
Consumer installment loans | Non-Covered Loans | 50
Loans portfolio by risk grad	8	14	92
Consumer installment loans | Non-Covered Loans | 60
Loans portfolio by risk grad
Other Loans
Loans portfolio by risk grad	25,160	18,068	17,658
Other Loans | Non-Covered Loans
Loans portfolio by risk grad	25,160	18,068	17,658
Other Loans | Non-Covered Loans | 20
Loans portfolio by risk grad	25,160	18,068	17,658
Other Loans | Non-Covered Loans | 60
Loans portfolio by risk grad