LOANS AND LEASES, Grade (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	$ 8,737,923	$ 8,870,311
Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	7,732,046	7,845,589
Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	146,917	124,694
Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	635,561	655,085
Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	11,220	8,850
Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,067	1,170
Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	211,112	234,923
Commercial and industrial segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,441,727	1,473,728
Commercial and industrial segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,376,983	1,415,731
Commercial and industrial segment [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	6,449	4,947
Commercial and industrial segment [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	47,783	43,549
Commercial and industrial segment [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	4,159	1,263
Commercial and industrial segment [Member] | Loss [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	247	405
Commercial and industrial segment [Member] | Impaired [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	6,106	7,833
Real estate segment [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,937,997	1,945,190
Real estate segment [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	501,331	514,362
Real estate segment [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	256,683	239,487
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,287,542	1,301,575
Real estate segment [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	858,110	908,362
Real estate segment [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,742,001	1,754,022
Real estate segment [Member] | Pass [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,729,187	1,742,593
Real estate segment [Member] | Pass [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	476,300	492,235
Real estate segment [Member] | Pass [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	229,865	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	1,151,368	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	601,396	619,497
Real estate segment [Member] | Pass [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,491,021	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	23,918	17,914
Real estate segment [Member] | Special Mention [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	2,793	2,775
Real estate segment [Member] | Special Mention [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,936	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	24,662	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	22,939	23,429
Real estate segment [Member] | Special Mention [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	47,535	37,409
Real estate segment [Member] | Substandard [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	151,679	148,267
Real estate segment [Member] | Substandard [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	19,626	17,050
Real estate segment [Member] | Substandard [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	21,763	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	83,041	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	121,556	136,412
Real estate segment [Member] | Substandard [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	171,891	179,295
Real estate segment [Member] | Doubtful [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	4,351	4,434
Real estate segment [Member] | Doubtful [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	754	1,134
Real estate segment [Member] | Doubtful [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	20	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	230	496
Real estate segment [Member] | Doubtful [Member] | Construction, acquisition and development [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	956	845
Real estate segment [Member] | Doubtful [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	72	0
Real estate segment [Member] | Loss [Member] | Consumer mortgages [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	446	189
Real estate segment [Member] | Loss [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	275	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	89	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	28,416	31,793
Real estate segment [Member] | Impaired [Member] | Home equity [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	1,583	675
Real estate segment [Member] | Impaired [Member] | Agricultural [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	3,099	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	28,152	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	111,263	128,179
Real estate segment [Member] | Impaired [Member] | Commercial [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	31,482	36,122
Credit cards segment [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	100,527	106,281
Credit cards segment [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	100,527	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	612,005	627,304
All other receivables [Member] | Pass [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	575,399	587,970
All other receivables [Member] | Special Mention [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	16,685	16,104
All other receivables [Member] | Substandard [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	18,222	20,263
All other receivables [Member] | Doubtful [Member]
Loan and lease portfolio, net of unearned income, by grade [Abstract]
Total	678	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	$ 1,011	$ 2,424