FAIR VALUE (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Impaired Loans
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	9,204	5,975
Impaired Loans | Minimum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	0.00%
Impaired Loans | Maximum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	50.00%
Impaired Loans | Commercial & Industrial
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	140	155
Impaired Loans | Farm real estate
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	421	480
Impaired Loans | Construction and development
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	291	404
Impaired Loans | Other
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	8,352	4,936
Other real estate owned
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	1,583	2,662
Other real estate owned | Construction and development
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	1,095	1,764
Other real estate owned | Other and 1-4 family
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	488	898
Mortgage servicing rights
Quantitative information about level 3 fair value measurements for financial instruments measured at fair value
Fair Value	2,763	2,942
Non-recurring basis | Level 3 | Impaired Loans | Commercial & Industrial | Liquidation Value Of Inventory Valuation Technique [Member]
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	15.00%	15.00%
Non-recurring basis | Level 3 | Impaired Loans | Commercial & Industrial | Liquidation Value Of Inventory Valuation Technique [Member] | Avg
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	15.00%	15.00%
Non-recurring basis | Level 3 | Impaired Loans | Farm real estate | Sales comparison approach | Minimum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)		35.00%
Non-recurring basis | Level 3 | Impaired Loans | Farm real estate | Sales comparison approach | Maximum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	40.00%	40.00%
Non-recurring basis | Level 3 | Impaired Loans | Farm real estate | Sales comparison approach | Avg
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	40.00%	37.00%
Non-recurring basis | Level 3 | Impaired Loans | Construction and development | Sales comparison approach | Minimum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	10.00%	10.00%
Non-recurring basis | Level 3 | Impaired Loans | Construction and development | Sales comparison approach | Maximum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	35.00%	50.00%
Non-recurring basis | Level 3 | Impaired Loans | Construction and development | Sales comparison approach | Avg
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	33.00%	41.00%
Non-recurring basis | Level 3 | Impaired Loans | Other | Sales comparison approach | Minimum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	0.00%	0.00%
Non-recurring basis | Level 3 | Impaired Loans | Other | Sales comparison approach | Maximum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	65.00%	60.00%
Non-recurring basis | Level 3 | Impaired Loans | Other | Sales comparison approach | Avg
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	26.00%	32.00%
Non-recurring basis | Level 3 | Other real estate owned | Construction and development | Sales comparison approach | Minimum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	10.00%	10.00%
Non-recurring basis | Level 3 | Other real estate owned | Construction and development | Sales comparison approach | Maximum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	49.00%	26.00%
Non-recurring basis | Level 3 | Other real estate owned | Construction and development | Sales comparison approach | Avg
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	18.00%	15.00%
Non-recurring basis | Level 3 | Other real estate owned | Other and 1-4 family | Sales comparison approach | Minimum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	10.00%	2.00%
Non-recurring basis | Level 3 | Other real estate owned | Other and 1-4 family | Sales comparison approach | Maximum
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	65.00%	35.00%
Non-recurring basis | Level 3 | Other real estate owned | Other and 1-4 family | Sales comparison approach | Avg
Unobservable Inputs
Adjustment for differences between comparable sales, type of property, current status of property (as a percent)	29.00%	17.00%
Non-recurring basis | Level 3 | Mortgage servicing rights | Cash flow analysis
Unobservable Inputs
Discount rate (as a percent)	10.00%	10.00%