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FAIR VALUES OF FINANCIAL DISCLOSURES (Additional Information) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Mortgage servicing rights $ 2,500,000   $ 2,184,000  
Weighted average interest rate, residential mortgages (in hundredths) 4.28%      
Weighted average maturity of residential mortgages 19 years      
Prepayment Speed used in unobservable assumptions 311   392  
Discount rate used to estimate fair value (in hundredths) 9.30%   9.20%  
Subtotal 2,263,065,000   2,257,844,000  
Valuation allowance 50,818,000 52,757,000 51,445,000 53,400,000
Recoveries 579,000 291,000    
Loans, net 2,211,642,000   2,206,075,000  
Non-Agency Residential Mortgage-Backed Securities [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Transfers into Level 3 3,334,000 0    
State and Municipal Securities [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Transfers into Level 3 0 0    
Commercial Real Estates [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 0.00%      
Commercial Real Estates [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 50.00%      
Inventory Finished Goods [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 35.00%      
Inventory Finished Goods [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 65.00%      
Finished Goods [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 30.00%      
Finished Goods [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 60.00%      
Inventory Work In Process [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 50.00%      
Inventory Work In Process [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 100.00%      
Equipment [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 30.00%      
Equipment [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 70.00%      
Marketable Securities [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 10.00%      
Marketable Securities [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 30.00%      
Impaired Loans [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Subtotal 29,900,000 51,300,000    
Valuation allowance 7,700,000 16,500,000    
Recoveries 2,300,000 1,700,000    
Mortgage Servicing Rights [Member]
       
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Loans at fair value 9,000      
Subtotal 13,000      
Valuation allowance 5,000      
Recoveries 37,000 62,000    
Additional impairment of investments $ 84,000