Loans (Allowance for Loan Losses by Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 15,550	$ 15,263	$ 14,584	$ 15,520
Provision for Loan Losses	0	(400)	550	(250)
Recoveries	121	150	1,065	315
Loans Charged-off	(79)	(549)	(607)	(1,121)
Ending Balance	15,592	14,464	15,592	14,464
Commercial and Industrial Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,661	4,258	3,983	4,555
Provision for Loan Losses	(563)	(361)	1,124	(618)
Recoveries	19	108	97	121
Loans Charged-off	0	(34)	(87)	(87)
Ending Balance	5,117	3,971	5,117	3,971
Commercial Real Estate Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,199	8,636	8,335	8,931
Provision for Loan Losses	206	(214)	(1,546)	(261)
Recoveries	55	7	785	85
Loans Charged-off	(6)	(212)	(120)	(538)
Ending Balance	7,454	8,217	7,454	8,217
Agricultural Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,016	817	946	989
Provision for Loan Losses	156	53	226	(119)
Recoveries	0	0	0	0
Loans Charged-off	0	0	0	0
Ending Balance	1,172	870	1,172	870
Home Equity Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	418	313	239	141
Provision for Loan Losses	(33)	89	148	326
Recoveries	0	0	42	0
Loans Charged-off	(7)	(193)	(51)	(258)
Ending Balance	378	209	378	209
Consumer Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	326	199	188	214
Provision for Loan Losses	77	64	296	100
Recoveries	41	33	127	104
Loans Charged-off	(65)	(93)	(232)	(215)
Ending Balance	379	203	379	203
Residential Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	435	280	281	186
Provision for Loan Losses	(33)	36	229	133
Recoveries	6	2	14	5
Loans Charged-off	(1)	(17)	(117)	(23)
Ending Balance	407	301	407	301
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	495	760	612	504
Provision for Loan Losses	190	(67)	73	189
Recoveries	0	0	0	0
Loans Charged-off	0	0	0	0
Ending Balance	$ 685	$ 693	$ 685	$ 693