Allowance for Credit Losses, Allocation of The Allowance For Loan Losses by Portfolio Segment and By Impairment Methodology (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Allowance for Credit Losses [Roll Forward]
Beginning Balance	$ 34,217	$ 33,017
Charge-Offs	(891)	(1,048)
Recoveries	523	398
Provision	425	1,850
Ending Balance	34,274	34,217
Ending Balance Individually Evaluated for Impairment	1,616	2,976
Ending Balance Collectively Evaluated for Impairment	32,658	31,241
Loans & Leases [Abstract]
Ending Balance	1,388,236	1,246,902
Ending Balance Individually Evaluated for Impairment	35,616	40,216
Ending Balance Collectively Evaluated for Impairment	1,352,620	1,206,686
Commercial Real Estate [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	6,464	5,823
Charge-Offs	(6)	0
Recoveries	0	0
Provision	(1,280)	641
Ending Balance	5,178	6,464
Ending Balance Individually Evaluated for Impairment	0	1,272
Ending Balance Collectively Evaluated for Impairment	5,178	5,192
Loans & Leases [Abstract]
Ending Balance	407,514	350,548
Ending Balance Individually Evaluated for Impairment	22,176	22,835
Ending Balance Collectively Evaluated for Impairment	385,338	327,713
Agricultural Real Estate [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	2,877	2,583
Charge-Offs	(575)	0
Recoveries	0	90
Provision	1,274	204
Ending Balance	3,576	2,877
Ending Balance Individually Evaluated for Impairment	0	0
Ending Balance Collectively Evaluated for Impairment	3,576	2,877
Loans & Leases [Abstract]
Ending Balance	328,264	311,992
Ending Balance Individually Evaluated for Impairment	0	5,423
Ending Balance Collectively Evaluated for Impairment	328,264	306,569
Real Estate Construction [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	986	1,933
Charge-Offs	0	0
Recoveries	0	0
Provision	(332)	(947)
Ending Balance	654	986
Ending Balance Individually Evaluated for Impairment	0	259
Ending Balance Collectively Evaluated for Impairment	654	727
Loans & Leases [Abstract]
Ending Balance	41,092	32,680
Ending Balance Individually Evaluated for Impairment	4,500	4,603
Ending Balance Collectively Evaluated for Impairment	36,592	28,077
Residential 1st Mortgages [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	1,219	1,251
Charge-Offs	(16)	(152)
Recoveries	0	53
Provision	(95)	67
Ending Balance	1,108	1,219
Ending Balance Individually Evaluated for Impairment	414	55
Ending Balance Collectively Evaluated for Impairment	694	1,164
Loans & Leases [Abstract]
Ending Balance	151,292	140,257
Ending Balance Individually Evaluated for Impairment	2,072	1,849
Ending Balance Collectively Evaluated for Impairment	149,220	138,408
Home Equity Lines and Loans [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	3,235	3,746
Charge-Offs	(91)	(259)
Recoveries	115	14
Provision	(492)	(266)
Ending Balance	2,767	3,235
Ending Balance Individually Evaluated for Impairment	209	182
Ending Balance Collectively Evaluated for Impairment	2,558	3,053
Loans & Leases [Abstract]
Ending Balance	35,477	42,042
Ending Balance Individually Evaluated for Impairment	1,045	1,199
Ending Balance Collectively Evaluated for Impairment	34,432	40,843
Agricultural [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	10,437	8,127
Charge-Offs	(23)	(294)
Recoveries	42	61
Provision	1,749	2,543
Ending Balance	12,205	10,437
Ending Balance Individually Evaluated for Impairment	122	996
Ending Balance Collectively Evaluated for Impairment	12,083	9,441
Loans & Leases [Abstract]
Ending Balance	256,414	221,032
Ending Balance Individually Evaluated for Impairment	522	3,937
Ending Balance Collectively Evaluated for Impairment	255,892	217,095
Commercial [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	7,963	8,733
Charge-Offs	(60)	(198)
Recoveries	312	117
Provision	(2,518)	(689)
Ending Balance	5,697	7,963
Ending Balance Individually Evaluated for Impairment	820	151
Ending Balance Collectively Evaluated for Impairment	4,877	7,812
Loans & Leases [Abstract]
Ending Balance	150,398	143,293
Ending Balance Individually Evaluated for Impairment	5,250	309
Ending Balance Collectively Evaluated for Impairment	145,148	142,984
Consumer & Other [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	182	207
Charge-Offs	(120)	(145)
Recoveries	54	63
Provision	60	57
Ending Balance	176	182
Ending Balance Individually Evaluated for Impairment	51	61
Ending Balance Collectively Evaluated for Impairment	125	121
Loans & Leases [Abstract]
Ending Balance	5,052	5,058
Ending Balance Individually Evaluated for Impairment	51	61
Ending Balance Collectively Evaluated for Impairment	5,001	4,997
Leases [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	0	0
Charge-Offs	0	0
Recoveries	0	0
Provision	639	0
Ending Balance	639	0
Ending Balance Individually Evaluated for Impairment	0	0
Ending Balance Collectively Evaluated for Impairment	639	0
Loans & Leases [Abstract]
Ending Balance	12,733	0
Ending Balance Individually Evaluated for Impairment	0	0
Ending Balance Collectively Evaluated for Impairment	12,733	0
Unallocated [Member]
Allowance for Credit Losses [Roll Forward]
Beginning Balance	854	614
Charge-Offs	0	0
Recoveries	0	0
Provision	1,420	240
Ending Balance	2,274	854
Ending Balance Individually Evaluated for Impairment	0	0
Ending Balance Collectively Evaluated for Impairment	2,274	854
Loans & Leases [Abstract]
Ending Balance	0	0
Ending Balance Individually Evaluated for Impairment	0	0
Ending Balance Collectively Evaluated for Impairment	0	0
Restructured loans [Member]
Loans & Leases [Abstract]
Ending Balance Individually Evaluated for Impairment	$ 28,400	$ 28,600