Allowance for Credit Losses, Loan Portfolio Allocated by Management's Internal Credit Ratings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	$ 1,388,236	$ 1,246,902
Loans outstanding rated doubtful or loss	0	0
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	407,514	350,548
Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	328,264	311,992
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	41,092	32,680
Residential 1st Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	151,292	140,257
Home Equity Lines and Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	35,477	42,042
Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	256,414	221,032
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	150,398	143,293
Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	5,052	5,058
Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	12,733	0
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	1,353,440	1,189,106
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	398,488	326,037
Pass [Member] | Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	325,926	299,642
Pass [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	39,460	26,445
Pass [Member] | Residential 1st Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	149,798	137,998
Pass [Member] | Home Equity Lines and Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	34,821	40,866
Pass [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	255,443	216,164
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	132,008	137,217
Pass [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	4,763	4,737
Pass [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	12,733
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	29,038	36,314
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	7,979	15,528
Special Mention [Member] | Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	2,338	6,605
Special Mention [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	1,632	6,235
Special Mention [Member] | Residential 1st Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	774	1,192
Special Mention [Member] | Home Equity Lines and Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	0	0
Special Mention [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	889	1,168
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	15,426	5,586
Special Mention [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	0	0
Special Mention [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	0
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	5,758	21,482
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	1,047	8,983
Substandard [Member] | Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	0	5,745
Substandard [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	0	0
Substandard [Member] | Residential 1st Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	720	1,067
Substandard [Member] | Home Equity Lines and Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	656	1,176
Substandard [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	82	3,700
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	2,964	490
Substandard [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	289	321
Substandard [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans & Leases:	$ 0