Loans (Allowance for Loan Losses by Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 14,584	$ 15,520
Provision for Loan Losses	350	350
Recoveries	823	111
Loans Charged-off	(273)	(247)
Ending Balance	15,484	15,734
Commercial and Industrial Loans and Leases [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	3,983	4,555
Provision for Loan Losses	1,322	195
Recoveries	69	3
Loans Charged-off	0	0
Ending Balance	5,374	4,753
Commercial Real Estate Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	8,335	8,931
Provision for Loan Losses	(1,057)	6
Recoveries	703	51
Loans Charged-off	(111)	(109)
Ending Balance	7,870	8,879
Agricultural Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	946	989
Provision for Loan Losses	(16)	(223)
Recoveries	0	0
Loans Charged-off	0	0
Ending Balance	930	766
Home Equity Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	239	141
Provision for Loan Losses	0	41
Recoveries	0	0
Loans Charged-off	(30)	(64)
Ending Balance	209	118
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	188	214
Provision for Loan Losses	48	(7)
Recoveries	47	55
Loans Charged-off	(97)	(73)
Ending Balance	186	189
Residential Mortgage Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	281	186
Provision for Loan Losses	7	113
Recoveries	4	2
Loans Charged-off	(35)	(1)
Ending Balance	257	300
Unallocated [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	612	504
Provision for Loan Losses	46	225
Recoveries	0	0
Loans Charged-off	0	0
Ending Balance	$ 658	$ 729