LOANS AND LEASES, Grade (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 8,870,311	$ 9,333,107
Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	7,845,589	8,527,975
Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	124,694	18,086
Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	655,085	501,800
Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	8,850	9,021
Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,170	2,820
Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	234,923	273,405
Commercial and industrial segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,473,728	1,491,183
Commercial and industrial segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,415,731	1,429,443
Commercial and industrial segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	4,947	5,764
Commercial and industrial segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	43,549	51,562
Commercial and industrial segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,263	1,577
Commercial and industrial segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	405	701
Commercial and industrial segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	7,833	2,136
Real estate segment [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,945,190	1,951,563
Real estate segment [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	514,362	543,272
Real estate segment [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	239,487	252,292
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,301,575	1,331,473
Real estate segment [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	908,362	1,174,743
Real estate segment [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,754,022	1,816,951
Real estate segment [Member] | Pass [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,742,593	1,813,740
Real estate segment [Member] | Pass [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	492,235	527,047
Real estate segment [Member] | Pass [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	213,280	226,054
Real estate segment [Member] | Pass [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,167,220	1,250,265
Real estate segment [Member] | Pass [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	619,497	845,725
Real estate segment [Member] | Pass [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,501,196	1,688,228
Real estate segment [Member] | Special Mention [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	17,914	1,867
Real estate segment [Member] | Special Mention [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	2,775	1,231
Real estate segment [Member] | Special Mention [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	3,795	309
Real estate segment [Member] | Special Mention [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	18,280	1,422
Real estate segment [Member] | Special Mention [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	23,429	1,882
Real estate segment [Member] | Special Mention [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	37,409	5,565
Real estate segment [Member] | Substandard [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	148,267	104,504
Real estate segment [Member] | Substandard [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	17,050	13,169
Real estate segment [Member] | Substandard [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	19,296	21,614
Real estate segment [Member] | Substandard [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	90,778	62,783
Real estate segment [Member] | Substandard [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	136,412	138,929
Real estate segment [Member] | Substandard [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	179,295	86,358
Real estate segment [Member] | Doubtful [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	4,434	3,106
Real estate segment [Member] | Doubtful [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,134	613
Real estate segment [Member] | Doubtful [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	20	0
Real estate segment [Member] | Doubtful [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	496	900
Real estate segment [Member] | Doubtful [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	845	2,243
Real estate segment [Member] | Doubtful [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	98
Real estate segment [Member] | Loss [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	189	123
Real estate segment [Member] | Loss [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	493	361
Real estate segment [Member] | Loss [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	20
Real estate segment [Member] | Loss [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	30
Real estate segment [Member] | Loss [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	1,046
Real estate segment [Member] | Loss [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	495
Real estate segment [Member] | Impaired [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	31,793	28,223
Real estate segment [Member] | Impaired [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	675	851
Real estate segment [Member] | Impaired [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	3,096	4,295
Real estate segment [Member] | Impaired [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	24,801	16,073
Real estate segment [Member] | Impaired [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	128,179	184,918
Real estate segment [Member] | Impaired [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	36,122	36,207
Credit cards segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	106,281	106,345
Credit cards segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	105,867	106,181
Credit cards segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	41	11
Credit cards segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	175	146
Credit cards segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	188	7
Credit cards segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	10	0
Credit cards segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	0
All other receivables [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	627,304	665,285
All other receivables [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	587,970	641,292
All other receivables [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	16,104	35
All other receivables [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	20,263	22,735
All other receivables [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	470	477
All other receivables [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	73	44
All other receivables [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 2,424	$ 702