Loans (Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Jun. 30, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Allowance for Loan Losses:
Individually Evaluated for Impairment	$ 3,681			$ 5,323
Collectively Evaluated for Impairment	10,774			10,109
Acquired with Deteriorated Credit Quality	9			88
Total Ending Allowance Balance	14,464		15,263	15,520		15,922	15,692	15,312
Loans:
Loans Individually Evaluated for Impairment	9,577			12,520
Loans Collectively Evaluated for Impairment	1,271,221			1,189,729
Loans Acquired with Deteriorated Credit Quality	8,909			11,174
Total Ending Loans Balance	1,289,707	[1]		1,213,423	[2]
Commercial and Industrial Loans and Leases [Member]
Allowance for Loan Losses:
Individually Evaluated for Impairment	461			1,279
Collectively Evaluated for Impairment	3,510			3,208
Acquired with Deteriorated Credit Quality	0			68
Total Ending Allowance Balance	3,971		4,258	4,555		4,854	4,707	3,493
Loans:
Loans Individually Evaluated for Impairment	2,622			2,547
Loans Collectively Evaluated for Impairment	334,789			331,920
Loans Acquired with Deteriorated Credit Quality	2,186			1,840
Total Ending Loans Balance	339,597	[1]		336,307	[2]
Commercial Real Estate Loans [Member]
Allowance for Loan Losses:
Individually Evaluated for Impairment	3,220			3,894
Collectively Evaluated for Impairment	4,988			5,017
Acquired with Deteriorated Credit Quality	9			20
Total Ending Allowance Balance	8,217		8,636	8,931		8,819	8,732	9,297
Loans:
Loans Individually Evaluated for Impairment	6,267			7,550
Loans Collectively Evaluated for Impairment	518,842			473,209
Loans Acquired with Deteriorated Credit Quality	6,438			9,037
Total Ending Loans Balance	531,547	[1]		489,796	[2]
Agricultural Loans [Member]
Allowance for Loan Losses:
Individually Evaluated for Impairment	0			150
Collectively Evaluated for Impairment	870			839
Acquired with Deteriorated Credit Quality	0			0
Total Ending Allowance Balance	870		817	989		911	890	926
Loans:
Loans Individually Evaluated for Impairment	688			2,423
Loans Collectively Evaluated for Impairment	187,787			180,152
Loans Acquired with Deteriorated Credit Quality	0			0
Total Ending Loans Balance	188,475	[1]		182,575	[2]
Home Equity Loans [Member]
Allowance for Loan Losses:
Individually Evaluated for Impairment	0			0
Collectively Evaluated for Impairment	209			141
Acquired with Deteriorated Credit Quality	0			0
Total Ending Allowance Balance	209		313	141		195	181	258
Loans:
Loans Individually Evaluated for Impairment	0			0
Loans Collectively Evaluated for Impairment	75,278			74,699
Loans Acquired with Deteriorated Credit Quality	0			0
Total Ending Loans Balance	75,278	[1]		74,699	[2]
Consumer Loans [Member]
Allowance for Loan Losses:
Individually Evaluated for Impairment	0			0
Collectively Evaluated for Impairment	203			214
Acquired with Deteriorated Credit Quality	0			0
Total Ending Allowance Balance	203		199	214		211	227	190
Loans:
Loans Individually Evaluated for Impairment	0			0
Loans Collectively Evaluated for Impairment	46,741			41,083
Loans Acquired with Deteriorated Credit Quality	138			148
Total Ending Loans Balance	46,879	[1]		41,231	[2]
Residential Mortgage Loans [Member]
Allowance for Loan Losses:
Individually Evaluated for Impairment	0			0
Collectively Evaluated for Impairment	301			186
Acquired with Deteriorated Credit Quality	0			0
Total Ending Allowance Balance	301		280	186		339	391	402
Loans:
Loans Individually Evaluated for Impairment	0			0
Loans Collectively Evaluated for Impairment	107,784			88,666
Loans Acquired with Deteriorated Credit Quality	147			149
Total Ending Loans Balance	107,931	[1]		88,815	[2]
Unallocated [Member]
Allowance for Loan Losses:
Individually Evaluated for Impairment	0			0
Collectively Evaluated for Impairment	693			504
Acquired with Deteriorated Credit Quality	0			0
Total Ending Allowance Balance	693		760	504		593	564	746
Loans:
Loans Individually Evaluated for Impairment	0			0
Loans Collectively Evaluated for Impairment	0			0
Loans Acquired with Deteriorated Credit Quality	0			0
Total Ending Loans Balance	$ 0	[1]		$ 0	[2]

[1] Total recorded investment in loans includes $5,417 in accrued interest.

[2] Total recorded investment in loans includes $5,522 in accrued interest.