FAIR VALUES OF FINANCIAL DISCLOSURES (Valuation Methodology and Unobservable Inputs for Level 3 Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans		$ 0
Mortgage servicing rights	2,500	2,184
Other real estate owned		0
Non-Recurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	22,259	29,364
Mortgage servicing rights	9	1,906
Other real estate owned	75	75
Commercial and Industrial Loans [Member] | Non-Recurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	3,814	3,980
Valuation Technique	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Commercial and Industrial Loans [Member] | Non-Recurring [Member] | Minimum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	13.00%	10.00%
Commercial and Industrial Loans [Member] | Non-Recurring [Member] | Maximum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	88.00%	99.00%
Commercial and Industrial Loans [Member] | Non-Recurring [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	33.00%	35.00%
Commercial Real Estate and Multi-Family Residential Loans [Member] | Non-Recurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	17,666	24,560
Valuation Technique	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Commercial Real Estate and Multi-Family Residential Loans [Member] | Non-Recurring [Member] | Minimum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	3.00%	4.00%
Commercial Real Estate and Multi-Family Residential Loans [Member] | Non-Recurring [Member] | Maximum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	43.00%	57.00%
Commercial Real Estate and Multi-Family Residential Loans [Member] | Non-Recurring [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	24.00%	23.00%
Agri-business and Agricultural Loans [Member] | Non-Recurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	283	268
Valuation Technique	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Agri-business and Agricultural Loans [Member] | Non-Recurring [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	13.00%	19.00%
Consumer 1-4 Family Mortgage Loans [Member] | Non-Recurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	456	510
Valuation Technique	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Consumer 1-4 Family Mortgage Loans [Member] | Non-Recurring [Member] | Minimum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	8.00%	8.00%
Consumer 1-4 Family Mortgage Loans [Member] | Non-Recurring [Member] | Maximum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	100.00%	100.00%
Consumer 1-4 Family Mortgage Loans [Member] | Non-Recurring [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	23.00%	39.00%
Other Consumer [Member] | Non-Recurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	40	46
Valuation Technique	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Other Consumer [Member] | Non-Recurring [Member] | Minimum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	21.00%	29.00%
Other Consumer [Member] | Non-Recurring [Member] | Maximum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	91.00%	100.00%
Other Consumer [Member] | Non-Recurring [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	38.00%	40.00%
Mortgage Servicing Rights [Member] | Non-Recurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	9	1,906
Valuation Technique	Discounted cash flows	Discounted cash flows
Unobservable Inputs	Discount rate	Discount rate
Mortgage Servicing Rights [Member] | Non-Recurring [Member] | Minimum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs		9.10%
Mortgage Servicing Rights [Member] | Non-Recurring [Member] | Maximum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs		9.50%
Mortgage Servicing Rights [Member] | Non-Recurring [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	9.50%	9.20%
Other Real Estate Owned [Member] | Non-Recurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	$ 75	$ 75
Valuation Technique	Appraisals	Appraisals
Unobservable Inputs	Discount to reflect current market conditions	Discount to reflect current market conditions
Other Real Estate Owned [Member] | Non-Recurring [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs	49.00%	49.00%