This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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FAIR VALUE DISCLOSURES, Valuation methodology (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Non-Recurring [Member] Level 3 [Member]	Dec. 31, 2011 Non-Recurring [Member] Level 3 [Member]	Sep. 30, 2012 Commercial and Industrial Loans [Member]	Sep. 30, 2012 Commercial and Industrial Loans [Member] Maximum [Member]	Sep. 30, 2012 Commercial and Industrial Loans [Member] Minimum [Member]	Sep. 30, 2012 Commercial and Industrial Loans [Member] Weighted Average [Member]	Sep. 30, 2012 Construction and Land Development Loans [Member]	Sep. 30, 2012 Construction and Land Development Loans [Member] Maximum [Member]	Sep. 30, 2012 Construction and Land Development Loans [Member] Minimum [Member]	Sep. 30, 2012 Construction and Land Development Loans [Member] Weighted Average [Member]	Sep. 30, 2012 Agri-business and Agricultural Loans [Member]	Sep. 30, 2012 Agri-business and Agricultural Loans [Member] Maximum [Member]	Sep. 30, 2012 Agri-business and Agricultural Loans [Member] Minimum [Member]	Sep. 30, 2012 Agri-business and Agricultural Loans [Member] Weighted Average [Member]	Sep. 30, 2012 Consumer 1-4 Family Mortgage Loans [Member]	Sep. 30, 2012 Consumer 1-4 Family Mortgage Loans [Member] Maximum [Member]	Sep. 30, 2012 Consumer 1-4 Family Mortgage Loans [Member] Minimum [Member]	Sep. 30, 2012 Consumer 1-4 Family Mortgage Loans [Member] Weighted Average [Member]	Sep. 30, 2012 Other Consumer [Member]	Sep. 30, 2012 Mortgage Servicing Rights [Member]	Sep. 30, 2012 Mortgage Servicing Rights [Member] Maximum [Member]	Sep. 30, 2012 Mortgage Servicing Rights [Member] Minimum [Member]	Sep. 30, 2012 Mortgage Servicing Rights [Member] Weighted Average [Member]	Sep. 30, 2012 Other Real Estate Owned [Member]	Sep. 30, 2012 Other Real Estate Owned [Member] Maximum [Member]	Sep. 30, 2012 Other Real Estate Owned [Member] Minimum [Member]	Sep. 30, 2012 Other Real Estate Owned [Member] Weighted Average [Member]
Valuation methodology and unobservable inputs for Level 3 assets measured at fair value [Abstract]
Securities available for sale	$ 481,256	$ 73,300			$ 6,641				$ 28,069				$ 266				$ 403				$ 27	$ 1,969				$ 81
Impaired loans			35,697	43,980
Mortgage servicing rights	2,000		1,969	1,734
Other real estate owned			$ 81	$ 730
Valuation Technique					Collateral based measurements				Collateral based measurements				Collateral based measurements				Collateral based measurements				Collateral based measurements	Discounted cash flows				Appraisals
Unobservable Inputs					Discount to reflect current market conditions and ultimate collectability.				Discount to reflect current market conditions and ultimate collectability.				Discount to reflect current market conditions and ultimate collectability.				Discount to reflect current market conditions and ultimate collectability.				Discount to reflect current market conditions and ultimate collectability.	Discount rate				Discount to reflect current market conditions
Range of Inputs (Average) (in hundredths)						83.00%	0.00%	(25.00%)		88.00%	0.00%	(40.00%)		24.00%	9.00%	(16.00%)		20.00%	0.00%	(8.00%)	40.00%		9.50%	9.10%	(9.20%)		61.00%	49.00%	50.00%