Loans (Risk Category of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 1,442,748	[1]	$ 1,390,802	[2]
Loans Acquired with Deteriorated Credit Quality	8,731		14,753
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	378,720	[1]	351,903	[2]
Loans Acquired with Deteriorated Credit Quality	387		1,981
Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	587,366	[1]	583,604	[2]
Loans Acquired with Deteriorated Credit Quality	6,724		10,871
Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	204,792	[1]	195,171	[2]
Loans Acquired with Deteriorated Credit Quality	0		0
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,095,227		1,056,827
Loans Acquired with Deteriorated Credit Quality	641		3,121
Pass | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	347,901		324,685
Pass | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	548,043		539,533
Pass | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	199,283		192,609
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	46,470		38,010
Loans Acquired with Deteriorated Credit Quality	1,748		661
Special Mention | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	18,465		15,485
Special Mention | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	22,959		20,168
Special Mention | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	5,046		2,357
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	29,181		35,841
Loans Acquired with Deteriorated Credit Quality	4,722		9,070
Substandard | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	12,354		11,733
Substandard | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	16,364		23,903
Substandard | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	463		205
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0		0
Loans Acquired with Deteriorated Credit Quality	0		0
Doubtful | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0		0
Doubtful | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0		0
Doubtful | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0		0
Total
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,170,878		1,130,678
Loans Acquired with Deteriorated Credit Quality	7,111		12,852
Total | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	378,720		351,903
Total | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	587,366		583,604
Total | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 204,792		$ 195,171

[1] Total recorded investment in loans includes $5,974 in accrued interest.

[2] Total recorded investment in loans includes $5,590 in accrued interest.