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INCOME AND FRANCHISE TAXES (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income and franchise taxes    
Income tax receivable, current   $ 2,395,000
Deferred tax assets    
Allowance for loan and lease losses 33,418,000 42,589,000
Accrued expenses 6,727,000 5,417,000
Employee retirement benefits 8,952,000 8,439,000
Federal and state tax credit carryforwards 35,305,000 34,616,000
Investment write-downs and write-offs 3,051,000 3,021,000
Interest on nonaccrual loans 4,047,000 5,703,000
Federal and state net operating loss carryforwards 86,339,000 98,409,000
Other 26,289,000 25,213,000
Total deferred tax assets 204,128,000 223,407,000
Deferred tax liabilities    
Intangible assets 14,962,000 16,308,000
FHLB stock dividends received 12,345,000 12,345,000
Net unrealized gain on derivatives recognized through AOCI 1,786,000 1,959,000
Leases 3,599,000 4,494,000
Deferred gain on curtailed retirement plan 3,339,000 3,339,000
Liability on utilization of state tax credits 7,475,000 7,851,000
Other 13,123,000 14,851,000
Total deferred tax liabilities 56,629,000 61,147,000
Deferred tax valuation allowance 147,499,000 162,260,000
Net change in the total valuation allowance 14,800,000 16,600,000
Change in valuation allowance recognized as income tax expense (benefit) 15,900,000 9,900,000
Change in valuation allowance recognized as expense (benefit) for AOCI (1,100,000) 6,700,000
Period of cumulative loss position 3 years  
Federal
    
Income and franchise taxes    
Income tax payable, current 9,000  
Income tax receivable, current   46,000
State
    
Income and franchise taxes    
Income tax receivable, current $ 1,800,000 $ 2,300,000