Loans (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	$ 1,249,463,000	$ 1,165,044,000
Less: Unearned Income	2,561,000	1,966,000
Total Loans	1,246,902,000	1,163,078,000
Less: Allowance for Loan Losses	34,217,000	33,017,000
Loans, Net	1,212,685,000	1,130,061,000
Collateral on borrowings lines with FHLB	403,200,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	353,109,000	307,670,000
Total Loans	350,548,000	305,704,000
Agricultural Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	311,992,000	280,139,000
Total Loans	311,992,000	280,139,000
Real Estate Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	32,680,000	29,607,000
Total Loans	32,680,000	29,607,000
Residential 1st Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	140,257,000	107,421,000
Total Loans	140,257,000	107,421,000
Home Equity Lines and Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	42,042,000	50,956,000
Total Loans	42,042,000	50,956,000
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	221,032,000	217,227,000
Total Loans	221,032,000	217,227,000
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	143,293,000	165,089,000
Total Loans	143,293,000	165,089,000
Consumer & Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Gross Loans	5,058,000	6,935,000
Total Loans	5,058,000	6,935,000
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	0	0
Federal Home Loan Bank [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral on borrowings lines with FHLB	403,200,000
Maximum Borrowing Capacity	300,500,000
Federal Reserve Bank [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral on borrowings lines with FHLB	401,300,000
Maximum Borrowing Capacity	$ 298,100,000