LOANS AND LEASES, Grade (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 8,636,989	$ 8,870,311
Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	7,806,414	7,845,589
Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	181,808	124,694
Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	485,217	655,085
Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	6,538	8,850
Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	284	1,170
Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	156,728	234,923
Commercial and industrial segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,476,611	1,473,728
Commercial and industrial segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,426,498	1,415,731
Commercial and industrial segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	14,663	4,947
Commercial and industrial segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	29,876	43,549
Commercial and industrial segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	729	1,263
Commercial and industrial segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	405
Commercial and industrial segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	4,845	7,833
Real estate segment [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,873,875	1,945,190
Real estate segment [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	486,074	514,362
Real estate segment [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	256,196	239,487
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,333,103	1,301,575
Real estate segment [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	735,808	908,362
Real estate segment [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,748,881	1,754,022
Real estate segment [Member] | Pass [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,691,682	1,742,593
Real estate segment [Member] | Pass [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	461,151	492,235
Real estate segment [Member] | Pass [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	227,138	213,280
Real estate segment [Member] | Pass [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,202,111	1,167,220
Real estate segment [Member] | Pass [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	567,881	619,497
Real estate segment [Member] | Pass [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,524,262	1,501,196
Real estate segment [Member] | Special Mention [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	32,840	17,914
Real estate segment [Member] | Special Mention [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	4,791	2,775
Real estate segment [Member] | Special Mention [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	5,729	3,795
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	31,087	18,280
Real estate segment [Member] | Special Mention [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	30,846	23,429
Real estate segment [Member] | Special Mention [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	53,455	37,409
Real estate segment [Member] | Substandard [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	131,141	148,267
Real estate segment [Member] | Substandard [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	17,619	17,050
Real estate segment [Member] | Substandard [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	17,947	19,296
Real estate segment [Member] | Substandard [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	82,816	90,778
Real estate segment [Member] | Substandard [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	75,031	136,412
Real estate segment [Member] | Substandard [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	120,591	179,295
Real estate segment [Member] | Doubtful [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	2,907	4,434
Real estate segment [Member] | Doubtful [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,057	1,134
Real estate segment [Member] | Doubtful [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	20
Real estate segment [Member] | Doubtful [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	369	496
Real estate segment [Member] | Doubtful [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	715	845
Real estate segment [Member] | Doubtful [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	160	0
Real estate segment [Member] | Loss [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	198	189
Real estate segment [Member] | Loss [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	76	493
Real estate segment [Member] | Loss [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	0
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	0
Real estate segment [Member] | Loss [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	0
Real estate segment [Member] | Loss [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	0
Real estate segment [Member] | Impaired [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	15,107	31,793
Real estate segment [Member] | Impaired [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,380	675
Real estate segment [Member] | Impaired [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	5,382	3,096
Real estate segment [Member] | Impaired [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	16,720	24,801
Real estate segment [Member] | Impaired [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	61,335	128,179
Real estate segment [Member] | Impaired [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	50,413	36,122
Credit cards segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	104,884	106,281
Credit cards segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	104,884	105,867
Credit cards segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	41
Credit cards segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	175
Credit cards segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	188
Credit cards segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	0	10
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	621,557	627,304
All other receivables [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	600,807	587,970
All other receivables [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	8,397	16,104
All other receivables [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	10,196	20,263
All other receivables [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	601	470
All other receivables [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	10	73
All other receivables [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 1,546	$ 2,424