LOANS AND LEASES, Non-performing and Nonaccrual Loans and Leases (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	$ 314,479	$ 347,499	$ 347,181
Loans and leases 90 days or more past due, still accruing	7,354	8,500	9,910
Restructured loans and leases still accruing	40,966	38,376	52,325
Total non-performing loans and leases	362,799	394,375	409,416
Days past due of principal or interest at which loans and leases may be placed in non-accrual status (in days)	90D
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	314,479	347,499	347,181
Commercial and industrial segment [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	11,122	13,075	12,339
Loans and leases 90 days or more past due, still accruing	1,846	675
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	11,122	13,075	12,339
Real estate segment [Member] | Consumer mortgages [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	44,100	34,021	25,561
Loans and leases 90 days or more past due, still accruing	4,136	6,521
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	44,100	34,021	25,561
Real estate segment [Member] | Home equity [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	2,634	811	1,361
Loans and leases 90 days or more past due, still accruing	134	173
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	2,634	811	1,361
Real estate segment [Member] | Agricultural [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	6,254	7,589	4,986
Loans and leases 90 days or more past due, still accruing	131	123
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	6,254	7,589	4,986
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	26,977	20,338	15,004
Loans and leases 90 days or more past due, still accruing	42	20
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	26,977	20,338	15,004
Real estate segment [Member] | Construction, acquisition and development [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	171,566	211,547	231,987
Loans and leases 90 days or more past due, still accruing	290	197
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	171,566	211,547	231,987
Real estate segment [Member] | Commercial [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	49,500	57,766	51,590
Loans and leases 90 days or more past due, still accruing	106	0
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	49,500	57,766	51,590
Credit cards segment [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	551	720	724
Loans and leases 90 days or more past due, still accruing	257	330
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	551	720	724
All other receivables [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	1,775	1,632	3,629
Loans and leases 90 days or more past due, still accruing	412	461
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	$ 1,775	$ 1,632	$ 3,629