Loans, Past Due (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Recorded investment of past due [Abstract]
Total Past Due	$ 10,429	$ 9,288
Current	685,791	681,925
PCI	3,483	3,818
Total financing receivables	699,703	695,031
90 Days or Greater and Accruing	620	623
Financing receivables on nonaccrual status [Abstract]
Total Past Due And Non-accrual	5,817	5,608
Current And Non-accrual	1,166	923
PCI Loans considered non accrual	0	0
Financing receivable nonaccrual status	6,983	6,531
Financing receivables on accrual status [Abstract]
Total Past Due And Still Accruing	4,612	3,680
Current And Still Accruing	684,625	681,002
PCI Loans still accruing	3,483	3,818
Total Financing Receivables And Still Accruing	$ 692,720	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	$ 3,260	2,509
Financing receivables on nonaccrual status [Abstract]
Total Past Due And Non-accrual	140	54
Financing receivables on accrual status [Abstract]
Total Past Due And Still Accruing	3,120	2,455
60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	872	773
Financing receivables on nonaccrual status [Abstract]
Total Past Due And Non-accrual	0	171
Financing receivables on accrual status [Abstract]
Total Past Due And Still Accruing	872	602
90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	6,297	6,006
Financing receivables on nonaccrual status [Abstract]
Total Past Due And Non-accrual	5,677	5,383
Financing receivables on accrual status [Abstract]
Total Past Due And Still Accruing	620	623
Real Estate Loans [Member] | Mortgages [Member]
Recorded investment of past due [Abstract]
Total Past Due	1,375	1,457
Current	140,299	139,547
PCI	33	35
Total financing receivables	141,707	141,039
90 Days or Greater and Accruing	173	321
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	1,395	949
Real Estate Loans [Member] | Mortgages [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	551	487
Real Estate Loans [Member] | Mortgages [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	96	283
Real Estate Loans [Member] | Mortgages [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	728	687
Real Estate Loans [Member] | Home Equity [Member]
Recorded investment of past due [Abstract]
Total Past Due	610	766
Current	59,671	61,602
PCI	0	0
Total financing receivables	60,281	62,368
90 Days or Greater and Accruing	71	73
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	161	59
Real Estate Loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	370	630
Real Estate Loans [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	64	15
Real Estate Loans [Member] | Home Equity [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	176	121
Real Estate Loans [Member] | Commercial [Member]
Recorded investment of past due [Abstract]
Total Past Due	6,043	5,020
Current	232,953	230,352
PCI	2,038	2,170
Total financing receivables	241,034	237,542
90 Days or Greater and Accruing	222	60
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	4,265	4,422
Real Estate Loans [Member] | Commercial [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	1,550	824
Real Estate Loans [Member] | Commercial [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	204	57
Real Estate Loans [Member] | Commercial [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	4,289	4,139
Real Estate Loans [Member] | Agricultural [Member]
Recorded investment of past due [Abstract]
Total Past Due	200	344
Current	57,676	56,740
PCI	723	738
Total financing receivables	58,599	57,822
90 Days or Greater and Accruing	0	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	32	34
Real Estate Loans [Member] | Agricultural [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	36	177
Real Estate Loans [Member] | Agricultural [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	164	167
Real Estate Loans [Member] | Agricultural [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
Real Estate Loans [Member] | Construction [Member]
Recorded investment of past due [Abstract]
Total Past Due	0	0
Current	8,699	15,011
PCI	0	0
Total financing receivables	8,699	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	282	325
Current	10,835	11,209
PCI	8	9
Total financing receivables	11,125	11,543
90 Days or Greater and Accruing	11	9
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	51	55
Consumer [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	180	239
Consumer [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	51	37
Consumer [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	51	49
Other Commercial Loans [Member]
Recorded investment of past due [Abstract]
Total Past Due	1,339	1,367
Current	53,585	55,316
PCI	681	866
Total financing receivables	55,605	57,549
90 Days or Greater and Accruing	143	160
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	1,079	1,012
Other Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	77	143
Other Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	209	214
Other Commercial Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total Past Due	1,053	1,010
Other Agricultural Loans [Member]
Recorded investment of past due [Abstract]
Total Past Due	580	9
Current	13,012	13,648
PCI	0	0
Total financing receivables	13,592	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	496	9
Other Agricultural Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total Past Due	84	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	109,061	98,500
PCI	0	0
Total financing receivables	109,061	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