Loans, Part V (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) rating	Dec. 31, 2018 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Number of risk rating approaches | rating	2
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	$ 132,350	$ 131,563
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	132,350	131,563
Commercial Risk, Construction, and Other Non-Consumer Loans [Member]
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	447,550	456,370
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	447,550	456,370
Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	55,692	56,978
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	55,692	56,978
Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	233,785	229,448
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	233,785	229,448
Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	102,961	108,795
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	102,961	108,795
Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	55,112	61,149
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	55,112	61,149
Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	61,281	59,431
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	61,281	59,431
Home Improvement and Home Equity
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	288	321
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	288	321
Total installment and student loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	70,781	71,811
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	70,781	71,811
Grades 1 and 2 | Commercial Risk, Construction, and Other Non-Consumer Loans [Member]
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	3,179	3,285
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	3,179	3,285
Grades 1 and 2 | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	310	324
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	310	324
Grades 1 and 2 | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	2,869	2,881
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	2,869	2,881
Grades 1 and 2 | Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grades 1 and 2 | Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	80
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	80
Grade 3 | Commercial Risk, Construction, and Other Non-Consumer Loans [Member]
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	1,019	1,028
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,019	1,028
Grade 3 | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grade 3 | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	1,019	1,028
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,019	1,028
Grade 3 | Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grade 3 | Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grades 4 and 5 – pass | Commercial Risk, Construction, and Other Non-Consumer Loans [Member]
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	422,927	434,201
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	422,927	434,201
Grades 4 and 5 – pass | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	51,380	53,843
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	51,380	53,843
Grades 4 and 5 – pass | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	225,815	222,970
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	225,815	222,970
Grades 4 and 5 – pass | Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	91,332	97,132
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	91,332	97,132
Grades 4 and 5 – pass | Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	54,400	60,256
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	54,400	60,256
Grade 6 – special mention | Commercial Risk, Construction, and Other Non-Consumer Loans [Member]
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	4,821	2,228
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	4,821	2,228
Grade 6 – special mention | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	1,654	48
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,654	48
Grade 6 – special mention | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	3,167	2,180
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	3,167	2,180
Grade 6 – special mention | Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grade 6 – special mention | Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grade 7 – substandard | Commercial Risk, Construction, and Other Non-Consumer Loans [Member]
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	15,604	15,628
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	15,604	15,628
Grade 7 – substandard | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	2,348	2,763
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	2,348	2,763
Grade 7 – substandard | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	915	389
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	915	389
Grade 7 – substandard | Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	11,629	11,663
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	11,629	11,663
Grade 7 – substandard | Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	712	813
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	712	813
Grade 8 – doubtful | Commercial Risk, Construction, and Other Non-Consumer Loans [Member]
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grade 8 – doubtful | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grade 8 – doubtful | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grade 8 – doubtful | Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Grade 8 – doubtful | Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Not graded
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	117,177	120,853
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	117,177	120,853
Not graded | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	47,193	49,563
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	47,193	49,563
Not graded | Home Improvement and Home Equity
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	268	300
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	268	300
Not graded | Total installment and student loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	69,716	70,990
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	69,716	70,990
Pass
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	14,219	9,987
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	14,219	9,987
Pass | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	13,298	9,186
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	13,298	9,186
Pass | Home Improvement and Home Equity
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	20	21
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	20	21
Pass | Total installment and student loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	901	780
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	901	780
Special mention
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	719	470
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	719	470
Special mention | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	585	470
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	585	470
Special mention | Home Improvement and Home Equity
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Special mention | Total installment and student loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	134	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	134	0
Substandard
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	235	253
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	235	253
Substandard | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	205	212
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	205	212
Substandard | Home Improvement and Home Equity
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Substandard | Total installment and student loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	30	41
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	30	41
Doubtful
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Doubtful | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Doubtful | Home Improvement and Home Equity
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	0
Doubtful | Total installment and student loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	0	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	$ 0	$ 0
Minimum | Grades 4 and 5 – pass
Financing Receivable, Recorded Investment [Line Items]
Notes receivable, period of loss recognition	3 years
Maximum | Grades 4 and 5 – pass
Financing Receivable, Recorded Investment [Line Items]
Notes receivable, period of loss recognition	4 years