Loans (Schedule of Risk Category of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	$ 1,390,802	[1]	$ 1,213,423	[2]
Loans Acquired with Deteriorated Credit Quality	14,753		11,174		16,121
Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	351,903	[1]	336,307	[2]
Loans Acquired with Deteriorated Credit Quality	1,981		1,840		2,596
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	583,604	[1]	489,796	[2]
Loans Acquired with Deteriorated Credit Quality	10,871		9,037		13,209
Agricultural Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	195,171	[1]	182,575	[2]
Loans Acquired with Deteriorated Credit Quality
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired with Deteriorated Credit Quality	3,121		319
Pass [Member] | Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	324,685		307,997
Pass [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	539,533		446,639
Pass [Member] | Agricultural Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	192,609		176,730
Pass [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	1,056,827		931,336
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired with Deteriorated Credit Quality	661		3,220
Special Mention [Member] | Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	15,485		14,441
Special Mention [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	20,168		21,338
Special Mention [Member] | Agricultural Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	2,357		2,855
Special Mention [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	38,010		38,634
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired with Deteriorated Credit Quality	9,070		7,338
Substandard [Member] | Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	11,733		13,869
Substandard [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	23,903		21,819
Substandard [Member] | Agricultural Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	205		2,990
Substandard [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance	35,841		38,678
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired with Deteriorated Credit Quality
Doubtful [Member] | Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance
Doubtful [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance
Doubtful [Member] | Agricultural Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance
Doubtful [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Ending Loans Balance

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

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