Loans, Past Due (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Recorded investment of past due [Abstract]
Total past due	$ 13,299	$ 15,546
Current	1,100,407	1,064,478
PCI	1,328	1,859
Total financing receivables	1,115,034	1,081,883
90 Days or greater and accruing	103	68
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	10,524	12,170
Current and non-accrual	2,699	1,554
PCI Loans considered non accrual	0	0
Financing receivable nonaccrual status	13,223	13,724
Financing receivables on accrual status [Abstract]
Total past due and still accruing	2,775	3,376
Current and still accruing	1,097,708	1,062,924
PCI Loans still accruing	1,328	1,859
Total financing receivables and still accruing	$ 1,101,811	1,068,159
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	$ 2,588	2,038
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	258	72
Financing receivables on accrual status [Abstract]
Total past due and still accruing	2,330	1,966
60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	572	1,595
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	230	253
Financing receivables on accrual status [Abstract]
Total past due and still accruing	342	1,342
90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	10,139	11,913
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	10,036	11,845
Financing receivables on accrual status [Abstract]
Total past due and still accruing	103	68
Real Estate Loans [Member] | Mortgages [Member]
Recorded investment of past due [Abstract]
Total past due	694	1,958
Current	155,165	154,501
PCI	24	28
Total financing receivables	155,883	156,487
90 Days or greater and accruing	19	20
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	916	1,079
Real Estate Loans [Member] | Mortgages [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	155	483
Real Estate Loans [Member] | Mortgages [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	205	789
Real Estate Loans [Member] | Mortgages [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	334	686
Real Estate Loans [Member] | Home Equity [Member]
Recorded investment of past due [Abstract]
Total past due	398	428
Current	59,436	58,390
PCI	0	0
Total financing receivables	59,834	58,818
90 Days or greater and accruing	0	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	92	82
Real Estate Loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	224	257
Real Estate Loans [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	86	108
Real Estate Loans [Member] | Home Equity [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	88	63
Real Estate Loans [Member] | Commercial [Member]
Recorded investment of past due [Abstract]
Total past due	4,614	6,336
Current	343,442	311,608
PCI	1,213	1,321
Total financing receivables	349,269	319,265
90 Days or greater and accruing	21	36
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	5,413	5,957
Real Estate Loans [Member] | Commercial [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	957	999
Real Estate Loans [Member] | Commercial [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	263	631
Real Estate Loans [Member] | Commercial [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	3,394	4,706
Real Estate Loans [Member] | Agricultural [Member]
Recorded investment of past due [Abstract]
Total past due	4,277	3,305
Current	301,671	281,215
PCI	0	0
Total financing receivables	305,948	284,520
90 Days or greater and accruing	0	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	3,549	3,206
Real Estate Loans [Member] | Agricultural [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	1,113	121
Real Estate Loans [Member] | Agricultural [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Real Estate Loans [Member] | Agricultural [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	3,164	3,184
Real Estate Loans [Member] | Construction [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Current	11,448	33,913
PCI	0	0
Total financing receivables	11,448	33,913
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	100	63
Current	9,609	9,795
PCI	0	0
Total financing receivables	9,709	9,858
90 Days or greater and accruing	22	12
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	0	14
Consumer [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	64	37
Consumer [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	14	14
Consumer [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	22	12
Other Commercial Loans [Member]
Recorded investment of past due [Abstract]
Total past due	1,960	2,255
Current	74,734	71,353
PCI	91	510
Total financing receivables	76,785	74,118
90 Days or greater and accruing	41	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	2,009	2,185
Other Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	15	141
Other Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	4	53
Other Commercial Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	1,941	2,061
Other Agricultural Loans [Member]
Recorded investment of past due [Abstract]
Total past due	1,256	1,201
Current	49,078	40,985
PCI	0	0
Total financing receivables	50,334	42,186
90 Days or greater and accruing	0	0
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	1,244	1,201
Other Agricultural Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	60	0
Other Agricultural Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Other Agricultural Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	1,196	1,201
State and Political Subdivision Loans [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Current	95,824	102,718
PCI	0	0
Total financing receivables	95,824	102,718
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