Loans (Recorded Investment in Nonaccrual and Loans Past Due Over 90 Days Still On Accrual by Class of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	$ 9,944	$ 10,357
Loans Past Due 90 Days or More & Still Accruing	0	0
Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	2,504	2,480
Loans Past Due 90 Days or More & Still Accruing	0	0
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	7,084	7,275
Loans Past Due 90 Days or More & Still Accruing	0	0
Agricultural Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	14	0
Loans Past Due 90 Days or More & Still Accruing	0	0
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	73	178
Loans Past Due 90 Days or More & Still Accruing	0	0
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	152	167
Loans Past Due 90 Days or More & Still Accruing	0	0
Residential Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	117	257
Loans Past Due 90 Days or More & Still Accruing	0	0
Loans Acquired With Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	262	148
Loans Past Due 90 Days or More & Still Accruing	$ 0	$ 0