LOANS AND LEASES, Grade (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 9,214,553	$ 9,333,107
Commercial and industrial segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,477,497	1,429,443
Credit cards segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	101,645	106,181
All other receivables [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	613,573	641,292
Consumer mortgage [Member] | Pass [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,817,381	1,813,740
Home equity [Member] | Pass [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	512,791	527,047
Agricultural [Member] | Pass [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	229,001	226,054
Commercial and industrial-owner occupied [Member] | Pass [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,269,218	1,250,265
Construction, acquisition and development [Member] | Pass [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	728,194	845,725
Commercial [Member] | Pass [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,606,844	1,688,228
Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	8,356,144	8,527,975
Commercial and industrial segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,312	5,764
Credit cards segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	11	11
All other receivables [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	76	35
Consumer mortgage [Member] | Special Mention [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	3,885	1,867
Home equity [Member] | Special Mention [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	793	1,231
Agricultural [Member] | Special Mention [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	2,486	309
Commercial and industrial-owner occupied [Member] | Special Mention [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	2,304	1,422
Construction, acquisition and development [Member] | Special Mention [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	20,348	1,882
Commercial [Member] | Special Mention [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	9,130	5,565
Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	40,345	18,086
Commercial and industrial segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	40,160	51,562
Credit cards segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	281	146
All other receivables [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	18,847	22,735
Consumer mortgage [Member] | Substandard [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	123,392	104,504
Home equity [Member] | Substandard [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	16,501	13,169
Agricultural [Member] | Substandard [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	16,507	21,614
Commercial and industrial-owner occupied [Member] | Substandard [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	73,272	62,783
Construction, acquisition and development [Member] | Substandard [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	114,222	138,929
Commercial [Member] | Substandard [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	102,762	86,358
Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	505,944	501,800
Commercial and industrial segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,282	1,577
Credit cards segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	18	7
All other receivables [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	411	477
Consumer mortgage [Member] | Doubtful [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	3,485	3,106
Home equity [Member] | Doubtful [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	427	613
Agricultural [Member] | Doubtful [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	0
Commercial and industrial-owner occupied [Member] | Doubtful [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	651	900
Construction, acquisition and development [Member] | Doubtful [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	594	2,243
Commercial [Member] | Doubtful [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	59	98
Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	6,927	9,021
Commercial and industrial segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	450	701
Credit cards segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	0
All other receivables [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	9	44
Consumer mortgage [Member] | Loss [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	87	123
Home equity [Member] | Loss [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	605	361
Agricultural [Member] | Loss [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	20
Commercial and industrial-owner occupied [Member] | Loss [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	99	30
Construction, acquisition and development [Member] | Loss [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	286	1,046
Commercial [Member] | Loss [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	495
Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,536	2,820
Commercial and industrial segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	5,985	2,136
Credit cards segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	0
All other receivables [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	2,343	702
Consumer mortgage [Member] | Impaired [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	23,269	28,223
Home equity [Member] | Impaired [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	670	851
Agricultural [Member] | Impaired [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	7,316	4,295
Commercial and industrial-owner occupied [Member] | Impaired [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	21,190	16,073
Construction, acquisition and development [Member] | Impaired [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	197,031	184,918
Commercial [Member] | Impaired [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	45,853	36,207
Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	303,657	273,405
Commercial and industrial segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,526,686	1,491,183
Consumer mortgage [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,971,499	1,951,563
Home equity [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	531,787	543,272
Agricultural [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	255,310	252,292
Commercial and industrial-owner occupied [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,366,734	1,331,473
Construction, acquisition and development [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,060,675	1,174,743
Commercial [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,764,648	1,816,951
Credit cards segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	101,955	106,345
All other receivables [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 635,259	$ 665,285