Loans (Schedule of Risk Category of Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 1,481,885	[1],[2]	$ 1,457,768	[3],[4]
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	397,753	[1]	380,851	[4]
Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	585,723	[1]	584,426	[4]
Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	224,591	[1]	219,640	[4]
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,135,450		1,112,028
Pass | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	370,372		351,250
Pass | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	546,263		545,804
Pass | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	218,815		214,974
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	44,276		46,019
Special Mention | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13,689		18,387
Special Mention | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	24,913		23,421
Special Mention | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	5,674		4,211
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	28,341		26,870
Substandard | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13,692		11,214
Substandard | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	14,547		15,201
Substandard | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	102		455
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	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	1,208,067		1,184,917
Total | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	397,753		380,851
Total | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	585,723		584,426
Total | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	224,591		219,640
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	7,217		8,361
Receivables Acquired with Deteriorated Credit Quality | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	403		354
Receivables Acquired with Deteriorated Credit Quality | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	5,934		6,385
Receivables Acquired with Deteriorated Credit Quality | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	0		0
Receivables Acquired with Deteriorated Credit Quality | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	870		651
Receivables Acquired with Deteriorated Credit Quality | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	1,520		1,697
Receivables Acquired with Deteriorated Credit Quality | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	3,947		4,391
Receivables Acquired with Deteriorated Credit Quality | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	0		0
Receivables Acquired with Deteriorated Credit Quality | Total
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	$ 6,337		$ 6,739

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

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

[3] Total recorded investment in loans includes $5,778 in accrued interest.

[4] Total recorded investment in loans includes $5,778 in accrued interest.