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FAIR VALUE (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Assets:      
Total impaired loans $ 9,204    
Impaired servicing rights 2,763    
Other real estate owned/assets held for sale 1,583   2,662
Gross carrying amount of impaired loans 12,598   9,151
Valuation allowance of impaired loans 3,394   3,176
Provision expenses of impaired loans 1,328 (17)  
Gross outstanding balance of servicing rights 3,638   4,067
Valuation allowance of servicing rights 875   1,125
Servicing rights charge included in earnings (250) 0  
Write-down of other real estate owned/assets held for sale 134 669  
Breakdown of properties by portfolio class      
Gross outstanding balance of other real estate owned/assets held for sale 2,317   4,334
Valuation allowance of other real estate owned/assets held for sale 734   1,672
Other real estate owned/assets held for sale 1,583   2,662
Construction and development
     
Assets:      
Other real estate owned/assets held for sale 1,095    
Breakdown of properties by portfolio class      
Gross outstanding balance of other real estate owned/assets held for sale 1,621    
Valuation allowance of other real estate owned/assets held for sale 526    
Other real estate owned/assets held for sale 1,095    
Other commercial real estate
     
Assets:      
Other real estate owned/assets held for sale 348    
Breakdown of properties by portfolio class      
Gross outstanding balance of other real estate owned/assets held for sale 483    
Valuation allowance of other real estate owned/assets held for sale 135    
Other real estate owned/assets held for sale 348    
1-4 family
     
Assets:      
Other real estate owned/assets held for sale 140    
Breakdown of properties by portfolio class      
Gross outstanding balance of other real estate owned/assets held for sale 213    
Valuation allowance of other real estate owned/assets held for sale 73    
Other real estate owned/assets held for sale 140    
Non-recurring basis
     
Assets:      
Total impaired loans 9,204   5,975
Impaired servicing rights 2,763   2,942
Other real estate owned/assets held for sale 1,583   2,662
Breakdown of properties by portfolio class      
Other real estate owned/assets held for sale 1,583   2,662
Non-recurring basis | Commercial and industrial
     
Assets:      
Total impaired loans 140   155
Gross carrying amount of impaired loans 496    
Valuation allowance of impaired loans 356    
Non-recurring basis | Farm
     
Assets:      
Total impaired loans 421   480
Gross carrying amount of impaired loans 625    
Valuation allowance of impaired loans 204    
Non-recurring basis | Construction and development
     
Assets:      
Total impaired loans 291   404
Other real estate owned/assets held for sale 1,095   1,764
Gross carrying amount of impaired loans 543    
Valuation allowance of impaired loans 252    
Breakdown of properties by portfolio class      
Other real estate owned/assets held for sale 1,095   1,764
Non-recurring basis | Other
     
Assets:      
Total impaired loans 8,119   4,936
Other real estate owned/assets held for sale 348   803
Gross carrying amount of impaired loans 10,690    
Valuation allowance of impaired loans 2,571    
Breakdown of properties by portfolio class      
Other real estate owned/assets held for sale 348   803
Non-recurring basis | 1-4 family
     
Assets:      
Total impaired loans 233    
Other real estate owned/assets held for sale 140   95
Gross carrying amount of impaired loans 244    
Valuation allowance of impaired loans 11    
Breakdown of properties by portfolio class      
Other real estate owned/assets held for sale 140   95
Non-recurring basis | Significant Unobservable Inputs (Level 3)
     
Assets:      
Total impaired loans 9,204   5,975
Impaired servicing rights 2,763   2,942
Other real estate owned/assets held for sale 1,583   2,662
Breakdown of properties by portfolio class      
Other real estate owned/assets held for sale 1,583   2,662
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Commercial and industrial
     
Assets:      
Total impaired loans 140   155
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Farm
     
Assets:      
Total impaired loans 421   480
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Construction and development
     
Assets:      
Total impaired loans 291   404
Other real estate owned/assets held for sale 1,095   1,764
Breakdown of properties by portfolio class      
Other real estate owned/assets held for sale 1,095   1,764
Non-recurring basis | Significant Unobservable Inputs (Level 3) | Other
     
Assets:      
Total impaired loans 8,119   4,936
Other real estate owned/assets held for sale 348   803
Breakdown of properties by portfolio class      
Other real estate owned/assets held for sale 348   803
Non-recurring basis | Significant Unobservable Inputs (Level 3) | 1-4 family
     
Assets:      
Total impaired loans 233    
Other real estate owned/assets held for sale 140   95
Breakdown of properties by portfolio class      
Other real estate owned/assets held for sale $ 140   $ 95