Loans (Allowance for Loan Losses by Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 15,484	$ 15,734	$ 14,584	$ 15,520
Provision for Loan Losses	200	(200)	550	150
Recoveries	121	54	944	165
Loans Charged-off	(255)	(325)	(528)	(572)
Ending Balance	15,550	15,263	15,550	15,263
Commercial and Industrial Loans and Leases [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	5,374	4,753	3,983	4,555
Provision for Loan Losses	365	(452)	1,687	(257)
Recoveries	9	10	78	13
Loans Charged-off	(87)	(53)	(87)	(53)
Ending Balance	5,661	4,258	5,661	4,258
Commercial Real Estate Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	7,870	8,879	8,335	8,931
Provision for Loan Losses	(695)	(53)	(1,752)	(47)
Recoveries	27	27	730	78
Loans Charged-off	(3)	(217)	(114)	(326)
Ending Balance	7,199	8,636	7,199	8,636
Agricultural Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	930	766	946	989
Provision for Loan Losses	86	51	70	(172)
Recoveries	0	0	0	0
Loans Charged-off	0	0	0	0
Ending Balance	1,016	817	1,016	817
Home Equity Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	209	118	239	141
Provision for Loan Losses	181	196	181	237
Recoveries	42	0	42	0
Loans Charged-off	(14)	(1)	(44)	(65)
Ending Balance	418	313	418	313
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	186	189	188	214
Provision for Loan Losses	171	43	219	36
Recoveries	39	16	86	71
Loans Charged-off	(70)	(49)	(167)	(122)
Ending Balance	326	199	326	199
Residential Mortgage Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	257	300	281	186
Provision for Loan Losses	255	(16)	262	97
Recoveries	4	1	8	3
Loans Charged-off	(81)	(5)	(116)	(6)
Ending Balance	435	280	435	280
Unallocated [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	658	729	612	504
Provision for Loan Losses	(163)	31	(117)	256
Recoveries	0	0	0	0
Loans Charged-off	0	0	0	0
Ending Balance	$ 495	$ 760	$ 495	$ 760