Loans (Schedule of Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 14,584	$ 15,520	$ 15,312
Provision for Loan Losses	150	350	2,412
Recoveries	1,210	386	326
Loans Charged-off	(1,015)	(1,672)	(2,530)
Ending Balance	14,929	14,584	15,520
Commercial and Industrial Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,983	4,555	3,493
Provision for Loan Losses	732	(197)	1,150
Recoveries	111	128	74
Loans Charged-off	(199)	(503)	(162)
Ending Balance	4,627	3,983	4,555
Commercial Real Estate Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8,335	8,931	9,297
Provision for Loan Losses	(1,596)	(160)	1,326
Recoveries	863	102	97
Loans Charged-off	(329)	(538)	(1,789)
Ending Balance	7,273	8,335	8,931
Agricultural Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	946	989	926
Provision for Loan Losses	177	(43)	63
Recoveries	0	0	0
Loans Charged-off	0	0	0
Ending Balance	1,123	946	989
Home Equity Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	239	141	258
Provision for Loan Losses	37	419	(32)
Recoveries	42	0	2
Loans Charged-off	(72)	(321)	(87)
Ending Balance	246	239	141
Consumer Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	188	214	190
Provision for Loan Losses	291	112	194
Recoveries	173	148	123
Loans Charged-off	(298)	(286)	(293)
Ending Balance	354	188	214
Residential Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	281	186	402
Provision for Loan Losses	437	111	(47)
Recoveries	21	8	30
Loans Charged-off	(117)	(24)	(199)
Ending Balance	622	281	186
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	612	504	746
Provision for Loan Losses	72	108	(242)
Recoveries	0	0	0
Loans Charged-off	0	0	0
Ending Balance	$ 684	$ 612	$ 504