LOANS AND LEASES, Non-Performing and Nonaccrual Loans and Leases (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	$ 331,076	$ 347,499	$ 263,758
Loans and leases 90 days or more past due, still accruing	3,980	8,500	17,696
Restructured loans and leases still accruing	44,786	38,376	20,813
Total non-performing loans	379,842	394,375	302,267
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]
Nonaccrual loans and leases	331,076	347,499	263,758
Troubled debt restructurings [Abstract]
Minimum period of sustained repayment performance by the borrower required for TDR loans to be returned to accrual status (in months)	6M
Commercial and industrial segment [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	9,337	13,075	6,280
Loans and leases 90 days or more past due, still accruing	118	675
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	9,337	13,075	6,280
Real estate segment [Member] | Consumer mortgage [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	34,174	34,021	22,618
Loans and leases 90 days or more past due, still accruing	2,482	6,521
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	34,174	34,021	22,618
Real estate segment [Member] | Home equity [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	1,232	811	1,565
Loans and leases 90 days or more past due, still accruing	242	173
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	1,232	811	1,565
Real estate segment [Member] | Agricultural [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	8,526	7,589	3,972
Loans and leases 90 days or more past due, still accruing	0	123
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	8,526	7,589	3,972
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	26,387	20,338	12,061
Loans and leases 90 days or more past due, still accruing	0	20
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	26,387	20,338	12,061
Real estate segment [Member] | Construction, acquisition and development [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	200,434	211,547	174,725
Loans and leases 90 days or more past due, still accruing	432	197
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	200,434	211,547	174,725
Real estate segment [Member] | Commercial [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	48,571	57,766	38,921
Loans and leases 90 days or more past due, still accruing	19	0
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	48,571	57,766	38,921
Credit cards segment [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	546	720	726
Loans and leases 90 days or more past due, still accruing	299	330
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	546	720	726
All other receivables [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	1,869	1,632	2,890
Loans and leases 90 days or more past due, still accruing	388	461
Nonaccrual loans and leases [Abstract]
Nonaccrual loans and leases	$ 1,869	$ 1,632	$ 2,890