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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Loans (Components of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal	$ 1,196,618	$ 1,207,901
Less: Unearned Income	(2,871)	(3,035)
Allowance for Loan Losses	(15,734)	(15,520)	(15,766)	(15,312)
Loans, Net	1,178,013	1,189,346
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and Industrial Loans and Leases	332,142	335,373
Commercial Real Estate Loans	498,582	488,496
Agricultural Loans	164,903	179,906
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Home Equity Loans	72,935	74,437
Consumer Loans	41,780	41,103
Residential Mortgage Loans	$ 86,276	$ 88,586