LOANS AND LEASES, Grade (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 9,055,905	$ 9,333,107
Commercial and industrial segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,503,391	1,491,183
Commercial and industrial segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,448,253	1,429,443
Commercial and industrial segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	2,657	5,764
Commercial and industrial segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	44,873	51,562
Commercial and industrial segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,049	1,577
Commercial and industrial segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	558	701
Commercial and industrial segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	6,001	2,136
Consumer mortgages [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,966,124	1,951,563
Consumer mortgages [Member] | Real estate segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,781,174	1,813,740
Consumer mortgages [Member] | Real estate segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	11,819	1,867
Consumer mortgages [Member] | Real estate segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	137,284	104,504
Consumer mortgages [Member] | Real estate segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	5,057	3,106
Consumer mortgages [Member] | Real estate segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	83	123
Consumer mortgages [Member] | Real estate segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	30,707	28,223
Home equity [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	523,030	543,272
Home equity [Member] | Real estate segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	503,067	527,047
Home equity [Member] | Real estate segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	309	1,231
Home equity [Member] | Real estate segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	16,058	13,169
Home equity [Member] | Real estate segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,002	613
Home equity [Member] | Real estate segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,068	361
Home equity [Member] | Real estate segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,526	851
Agricultural [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	249,715	252,292
Agricultural [Member] | Real estate segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	224,247	226,054
Agricultural [Member] | Real estate segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	2,436	309
Agricultural [Member] | Real estate segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	18,815	21,614
Agricultural [Member] | Real estate segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	0
Agricultural [Member] | Real estate segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	20
Agricultural [Member] | Real estate segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	4,217	4,295
Commercial and industrial-owner occupied [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,329,644	1,331,473
Commercial and industrial-owner occupied [Member] | Real estate segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,206,806	1,250,265
Commercial and industrial-owner occupied [Member] | Real estate segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	17,006	1,422
Commercial and industrial-owner occupied [Member] | Real estate segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	82,588	62,783
Commercial and industrial-owner occupied [Member] | Real estate segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	865	900
Commercial and industrial-owner occupied [Member] | Real estate segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	30
Commercial and industrial-owner occupied [Member] | Real estate segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	22,379	16,073
Construction, acquisition and development [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	976,694	1,174,743
Construction, acquisition and development [Member] | Real estate segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	653,635	845,725
Construction, acquisition and development [Member] | Real estate segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	18,221	1,882
Construction, acquisition and development [Member] | Real estate segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	134,932	138,929
Construction, acquisition and development [Member] | Real estate segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,782	2,243
Construction, acquisition and development [Member] | Real estate segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	123	1,046
Construction, acquisition and development [Member] | Real estate segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	168,001	184,918
Commercial [Member] | Real estate segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,772,003	1,816,951
Commercial [Member] | Real estate segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,537,944	1,688,228
Commercial [Member] | Real estate segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	26,151	5,565
Commercial [Member] | Real estate segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	162,076	86,358
Commercial [Member] | Real estate segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	98
Commercial [Member] | Real estate segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	495
Commercial [Member] | Real estate segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	45,832	36,207
Credit cards segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	103,232	106,345
Credit cards segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	102,873	106,181
Credit cards segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	11	11
Credit cards segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	158	146
Credit cards segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	190	7
Credit cards segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	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	632,072	665,285
All other receivables [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	610,381	641,292
All other receivables [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	108	35
All other receivables [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	19,857	22,735
All other receivables [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	483	477
All other receivables [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	17	44
All other receivables [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,226	702
Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	8,068,380	8,527,975
Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	78,718	18,086
Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	616,641	501,800
Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	10,428	9,021
Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,849	2,820
Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 279,889	$ 273,405