LOANS (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Nonaccrual loans	$ 31,558	$ 31,343
Loans 90 days past due and accruing	314	1
Total nonperforming loans	614,758	627,249	666,653
Other real estate owned	15,118	14,262
Total nonperforming assets	1,286,146	1,268,595
Non Performing Assets [Member]
Nonaccrual loans	31,558	31,343
Loans 90 days past due and accruing	314	1
Restructured loans	37,581	38,460
Total nonperforming loans	69,453	69,804
Other real estate owned	15,118	14,262
Other assets	59	32
Nonperforming investment securities	3,045	3,045
Total nonperforming assets	$ 87,675	$ 87,143
Nonperforming assets to total assets	6.82%	6.87%
Allowance for loan losses to nonperforming loans	25.77%	24.78%