Loans, Past Due (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Recorded investment of past due [Abstract]
Total Past Due	$ 17,570	$ 9,288
Current	730,158	681,925
PCI	3,565	3,818
Total financing receivables	751,293	695,031
90 Days or Greater and Accruing	541	623
Financing receivables on nonaccrual status [Abstract]
Total Past Due And Non-accrual	9,194	5,608
Current And Non-accrual	837	923
PCI Loans considered non accrual	0	0
Financing receivable nonaccrual status	10,031	6,531
Financing receivables on accrual status [Abstract]
Total Past Due And Still Accruing	8,376	3,680
Current And Still Accruing	729,321	681,002
PCI Loans still accruing	3,565	3,818
Total Financing Receivables And Still Accruing	$ 741,262	688,500
Minimum [Member]
Financing receivables on nonaccrual status [Abstract]
Period of past due after which loans considered as non accrual	90 days
30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	$ 7,287	2,509
Financing receivables on nonaccrual status [Abstract]
Total Past Due And Non-accrual	331	54
Financing receivables on accrual status [Abstract]
Total Past Due And Still Accruing	6,956	2,455
60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	898	773
Financing receivables on nonaccrual status [Abstract]
Total Past Due And Non-accrual	19	171
Financing receivables on accrual status [Abstract]
Total Past Due And Still Accruing	879	602
90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	9,385	6,006
Financing receivables on nonaccrual status [Abstract]
Total Past Due And Non-accrual	8,844	5,383
Financing receivables on accrual status [Abstract]
Total Past Due And Still Accruing	541	623
Real Estate Loans [Member] | Mortgages [Member]
Recorded investment of past due [Abstract]
Total Past Due	2,001	1,457
Current	144,094	139,547
PCI	35	35
Total financing receivables	146,130	141,039
90 Days or Greater and Accruing	173	321
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	1,673	949
Real Estate Loans [Member] | Mortgages [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	720	487
Real Estate Loans [Member] | Mortgages [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	153	283
Real Estate Loans [Member] | Mortgages [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	1,128	687
Real Estate Loans [Member] | Home Equity [Member]
Recorded investment of past due [Abstract]
Total Past Due	480	766
Current	58,482	61,602
PCI	0	0
Total financing receivables	58,962	62,368
90 Days or Greater and Accruing	17	73
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	100	59
Real Estate Loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	398	630
Real Estate Loans [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	15	15
Real Estate Loans [Member] | Home Equity [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	67	121
Real Estate Loans [Member] | Commercial [Member]
Recorded investment of past due [Abstract]
Total Past Due	6,467	5,020
Current	242,675	230,352
PCI	2,007	2,170
Total financing receivables	251,149	237,542
90 Days or Greater and Accruing	259	60
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	4,056	4,422
Real Estate Loans [Member] | Commercial [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	2,151	824
Real Estate Loans [Member] | Commercial [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	251	57
Real Estate Loans [Member] | Commercial [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	4,065	4,139
Real Estate Loans [Member] | Agricultural [Member]
Recorded investment of past due [Abstract]
Total Past Due	2,650	344
Current	85,164	56,740
PCI	741	738
Total financing receivables	88,555	57,822
90 Days or Greater and Accruing	58	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	26	34
Real Estate Loans [Member] | Agricultural [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	2,415	177
Real Estate Loans [Member] | Agricultural [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	177	167
Real Estate Loans [Member] | Agricultural [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	58	0
Real Estate Loans [Member] | Construction [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
Current	18,774	15,011
PCI	0	0
Total financing receivables	18,774	15,011
90 Days or Greater and Accruing	0	0
Real Estate Loans [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
Real Estate Loans [Member] | Construction [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
Real Estate Loans [Member] | Construction [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
Consumer [Member]
Recorded investment of past due [Abstract]
Total Past Due	243	325
Current	10,979	11,209
PCI	4	9
Total financing receivables	11,226	11,543
90 Days or Greater and Accruing	34	9
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	42	55
Consumer [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	149	239
Consumer [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	42	37
Consumer [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	52	49
Other Commercial Loans [Member]
Recorded investment of past due [Abstract]
Total Past Due	4,318	1,367
Current	51,966	55,316
PCI	778	866
Total financing receivables	57,062	57,549
90 Days or Greater and Accruing	0	160
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	4,134	1,012
Other Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	303	143
Other Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	214
Other Commercial Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	4,015	1,010
Other Agricultural Loans [Member]
Recorded investment of past due [Abstract]
Total Past Due	1,411	9
Current	19,785	13,648
PCI	0	0
Total financing receivables	21,196	13,657
90 Days or Greater and Accruing	0	0
Other Agricultural Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	1,151	9
Other Agricultural Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	260	0
Other Agricultural Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
State and Political Subdivision Loans [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
Current	98,239	98,500
PCI	0	0
Total financing receivables	98,239	98,500
90 Days or Greater and Accruing	0	0
State and Political Subdivision Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
State and Political Subdivision Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
State and Political Subdivision Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	$ 0	$ 0