Loans (Summary Of Credit Quality Indicate Financial Receivable (Non-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
Non-Covered Loans
Loans portfolio by risk grad	1,365,489	1,332,086	1,360,063
Non-Covered Loans | 10
Loans portfolio by risk grad	28,282	23,930	20,376
Non-Covered Loans | 15
Loans portfolio by risk grad	251,157	261,489	202,152
Non-Covered Loans | 20
Loans portfolio by risk grad	540,562	485,364	534,498
Non-Covered Loans | 23
Loans portfolio by risk grad	30,131	29,730	29,833
Non-Covered Loans | 25
Loans portfolio by risk grad	397,984	386,365	407,133
Non-Covered Loans | 30
Loans portfolio by risk grad	36,307	41,584	65,528
Non-Covered Loans | 40
Loans portfolio by risk grad	80,824	102,947	99,612
Non-Covered Loans | 50
Loans portfolio by risk grad	242	677	922
Non-Covered Loans | 60
Loans portfolio by risk grad			9
Commercial, financial & agricultural
Loans portfolio by risk grad	174,903	142,960	150,377
Commercial, financial & agricultural | Non-Covered Loans
Loans portfolio by risk grad	174,903	142,960	150,377
Commercial, financial & agricultural | Non-Covered Loans | 10
Loans portfolio by risk grad	20,395	17,213	13,799
Commercial, financial & agricultural | Non-Covered Loans | 15
Loans portfolio by risk grad	11,909	15,379	11,307
Commercial, financial & agricultural | Non-Covered Loans | 20
Loans portfolio by risk grad	79,985	60,631	61,543
Commercial, financial & agricultural | Non-Covered Loans | 23
Loans portfolio by risk grad		32	1,614
Commercial, financial & agricultural | Non-Covered Loans | 25
Loans portfolio by risk grad	54,072	42,815	54,635
Commercial, financial & agricultural | Non-Covered Loans | 30
Loans portfolio by risk grad	1,404	2,509	1,477
Commercial, financial & agricultural | Non-Covered Loans | 40
Loans portfolio by risk grad	7,137	4,258	5,362
Commercial, financial & agricultural | Non-Covered Loans | 50
Loans portfolio by risk grad	1	123	640
Commercial, financial & agricultural | Non-Covered Loans | 60
Loans portfolio by risk grad
Real estate - construction & development
Loans portfolio by risk grad	124,556	130,270	143,684
Real estate - construction & development | Non-Covered Loans
Loans portfolio by risk grad	124,556	130,270	143,684
Real estate - construction & development | Non-Covered Loans | 10
Loans portfolio by risk grad	17	20	213
Real estate - construction & development | Non-Covered Loans | 15
Loans portfolio by risk grad	3,628	5,391	3,483
Real estate - construction & development | Non-Covered Loans | 20
Loans portfolio by risk grad	39,077	32,654	36,007
Real estate - construction & development | Non-Covered Loans | 23
Loans portfolio by risk grad	6,691	7,994	7,360
Real estate - construction & development | Non-Covered Loans | 25
Loans portfolio by risk grad	57,266	62,029	67,615
Real estate - construction & development | Non-Covered Loans | 30
Loans portfolio by risk grad	4,018	2,027	6,071
Real estate - construction & development | Non-Covered Loans | 40
Loans portfolio by risk grad	13,703	19,864	22,659
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	675,404	672,765	681,228
Real estate - commercial and farmland | Non-Covered Loans
Loans portfolio by risk grad	675,404	672,765	681,228
Real estate - commercial and farmland | Non-Covered Loans | 10
Loans portfolio by risk grad	230	235	329
Real estate - commercial and farmland | Non-Covered Loans | 15
Loans portfolio by risk grad	158,608	151,068	151,047
Real estate - commercial and farmland | Non-Covered Loans | 20
Loans portfolio by risk grad	287,874	272,241	274,185
Real estate - commercial and farmland | Non-Covered Loans | 23
Loans portfolio by risk grad	9,578	10,679	8,484
Real estate - commercial and farmland | Non-Covered Loans | 25
Loans portfolio by risk grad	170,342	163,554	157,862
Real estate - commercial and farmland | Non-Covered Loans | 30
Loans portfolio by risk grad	17,870	21,490	44,388
Real estate - commercial and farmland | Non-Covered Loans | 40
Loans portfolio by risk grad	30,902	53,498	44,933
Real estate - commercial and farmland | Non-Covered Loans | 60
Loans portfolio by risk grad
Real estate - residential
Loans portfolio by risk grad	332,124	330,727	336,485
Real estate - residential | Non-Covered Loans
Loans portfolio by risk grad	332,124	330,727	336,485
Real estate - residential | Non-Covered Loans | 10
Loans portfolio by risk grad	414	252	109
Real estate - residential | Non-Covered Loans | 15
Loans portfolio by risk grad	75,752	88,586	35,416
Real estate - residential | Non-Covered Loans | 20
Loans portfolio by risk grad	93,018	80,989	128,581
Real estate - residential | Non-Covered Loans | 23
Loans portfolio by risk grad	13,839	10,997	12,346
Real estate - residential | Non-Covered Loans | 25
Loans portfolio by risk grad	109,269	110,786	121,094
Real estate - residential | Non-Covered Loans | 30
Loans portfolio by risk grad	12,461	15,001	13,028
Real estate - residential | Non-Covered Loans | 40
Loans portfolio by risk grad	27,306	23,867	25,911
Real estate - residential | Non-Covered Loans | 50
Loans portfolio by risk grad	65	249
Real estate - residential | Non-Covered Loans | 60
Loans portfolio by risk grad
Consumer installment loans
Loans portfolio by risk grad	41,431	37,296	35,584
Consumer installment loans | Non-Covered Loans
Loans portfolio by risk grad	41,431	37,296	35,584
Consumer installment loans | Non-Covered Loans | 10
Loans portfolio by risk grad	7,226	6,210	5,926
Consumer installment loans | Non-Covered Loans | 15
Loans portfolio by risk grad	1,260	1,065	899
Consumer installment loans | Non-Covered Loans | 20
Loans portfolio by risk grad	23,537	20,781	21,477
Consumer installment loans | Non-Covered Loans | 23
Loans portfolio by risk grad	23	28	29
Consumer installment loans | Non-Covered Loans | 25
Loans portfolio by risk grad	7,035	7,181	5,927
Consumer installment loans | Non-Covered Loans | 30
Loans portfolio by risk grad	554	557	564
Consumer installment loans | Non-Covered Loans | 40
Loans portfolio by risk grad	1,776	1,460	747
Consumer installment loans | Non-Covered Loans | 50
Loans portfolio by risk grad	20	14	6
Consumer installment loans | Non-Covered Loans | 60
Loans portfolio by risk grad			9
Other Loans
Loans portfolio by risk grad	17,071	18,068	12,705
Other Loans | Non-Covered Loans
Loans portfolio by risk grad	17,071	18,068	12,705
Other Loans | Non-Covered Loans | 20
Loans portfolio by risk grad	17,071	18,068	12,705
Other Loans | Non-Covered Loans | 60
Loans portfolio by risk grad