LOANS AND LEASES, Non-performing and Nonaccrual Loans and Leases (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	$ 149,542	$ 207,241	$ 240,246
Loans and leases 90 days or more past due, still accruing	1,440	1,210	1,632
Restructured loans and leases still accruing	16,953	25,099	25,071
Total non-performing loans and leases	167,935	233,550	266,949
Days past due of principal or interest at which loans and leases may be placed in non-accrual status	90 days
Commercial and industrial segment [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	6,225	9,311	13,156
Loans and leases 90 days or more past due, still accruing		414
Real estate segment [Member] | Consumer mortgages [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	34,226	36,133	35,660
Loans and leases 90 days or more past due, still accruing	1,107	512
Real estate segment [Member] | Home equity [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	3,862	3,497	2,995
Real estate segment [Member] | Agricultural [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	5,007	7,587	8,390
Loans and leases 90 days or more past due, still accruing		10
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	17,084	20,910	26,957
Loans and leases 90 days or more past due, still accruing		19
Real estate segment [Member] | Construction, acquisition and development [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	39,315	66,635	104,283
Real estate segment [Member] | Commercial real estate [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	40,940	57,656	44,359
Loans and leases 90 days or more past due, still accruing	120
Credit cards segment [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	398	415	364
Loans and leases 90 days or more past due, still accruing	213	228
All other [Member]
Nonaccrual loans and leases [Abstract]
Non-accrual loans and leases	2,485	5,097	4,082
Loans and leases 90 days or more past due, still accruing		$ 27