LOAN AND LEASES (4) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	$ 219,738	$ 276,798	$ 314,479
Loans and leases 90 days or more past due, still accruing	1,442	3,434	7,354
Restructured loans and leases still accruing	26,147	42,018	40,966
Total non-performing loans and leases	247,327	322,250	362,799
Days past due of principal or interest at which loans and leases may be placed in non-accrual status (in days)	90 days
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	219,738	276,798	314,479
Commercial and industrial segment [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	8,674	12,260	11,122
Loans and leases 90 days or more past due, still accruing	45	12
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	8,674	12,260	11,122
Real estate segment [Member] | Consumer mortgages [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	35,599	47,878	44,100
Loans and leases 90 days or more past due, still accruing	1,027	2,974
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	35,599	47,878	44,100
Real estate segment [Member] | Home equity [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	3,471	2,036	2,634
Loans and leases 90 days or more past due, still accruing	0	0
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	3,471	2,036	2,634
Real estate segment [Member] | Agricultural [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	7,190	4,179	6,254
Loans and leases 90 days or more past due, still accruing	0	0
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	7,190	4,179	6,254
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	27,059	33,112	26,977
Loans and leases 90 days or more past due, still accruing	119	0
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	27,059	33,112	26,977
Real estate segment [Member] | Construction, acquisition and development [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	92,351	133,110	171,566
Loans and leases 90 days or more past due, still accruing	0	0
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	92,351	133,110	171,566
Real estate segment [Member] | Commercial Real Estate [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	40,514	40,616	49,500
Loans and leases 90 days or more past due, still accruing	0	0
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	40,514	40,616	49,500
Credit cards segment [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	465	594	551
Loans and leases 90 days or more past due, still accruing	236	299
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	465	594	551
All other receivables [Member]
Non-performing loans and leases [Abstract]
Non-accrual loans and leases	4,415	3,013	1,775
Loans and leases 90 days or more past due, still accruing	15	149
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	$ 4,415	$ 3,013	$ 1,775