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FAIR VALUE MEASUREMENTS (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Impaired loans $ 3,075 $ 2,973  
Foreclosed Assets 1,822 1,774 2,939
Mortgage servicing rights 1,443 1,233  
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
     
Impaired loans        
Foreclosed Assets        
Mortgage servicing rights        
Total assets        
Nonrecurring | Siginficant Other Observable Inputs (Level 2)
     
Impaired loans 869 328  
Foreclosed Assets 797 752  
Mortgage servicing rights        
Total assets 1,666 1,080  
Nonrecurring | Significant Unobservable Inputs (Level 3)
     
Impaired loans 2,206 2,645  
Foreclosed Assets 1,025 1,022  
Mortgage servicing rights 1,443 1,233  
Total assets 4,674 4,900  
Nonrecurring | Estimate of Fair Value, Fair Value Disclosure
     
Impaired loans 3,075 2,973  
Foreclosed Assets 1,822 1,774  
Mortgage servicing rights 1,443 1,233  
Total assets $ 6,340 $ 5,980