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PREMISES AND EQUIPMENT (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Premises and equipment disclosures      
Premises and equipment, gross $ 178,588,000 $ 196,640,000  
Accumulated depreciation and amortization (59,662,000) (60,721,000)  
Property, Plant and Equipment, Net 118,926,000 135,919,000  
Depreciation expense 12,100,000 13,800,000 7,500,000
Land
     
Premises and equipment disclosures      
Premises and equipment, gross 15,545,000 15,545,000  
Office buildings
     
Premises and equipment disclosures      
Premises and equipment, gross 92,041,000 108,131,000  
Leasehold improvements
     
Premises and equipment disclosures      
Premises and equipment, gross 25,084,000 24,534,000  
Furniture, fixtures and equipment
     
Premises and equipment disclosures      
Premises and equipment, gross $ 45,918,000 $ 48,430,000  
Furniture and Fixtures
     
Premises and equipment disclosures      
Estimated useful life (in years) 7    
Office Equipment
     
Premises and equipment disclosures      
Estimated useful life (in years) 5    
Building and Building Improvements
     
Premises and equipment disclosures      
Estimated useful life (in years) 25