Loans, Part V (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) rating	Dec. 31, 2018 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Number of risk rating approaches | rating	2
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	$ 124,113	$ 131,563
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	124,113	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	449,308	456,370
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	449,308	456,370
Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	55,145	56,978
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	55,145	56,978
Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	227,525	229,448
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	227,525	229,448
Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	114,611	108,795
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	114,611	108,795
Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	52,027	61,149
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	52,027	61,149
Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	54,142	59,431
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	54,142	59,431
Home Improvement and Home Equity
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	221	321
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	221	321
Total installment and student loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	69,750	71,811
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	69,750	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	3,169	3,285
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	3,169	3,285
Grades 1 and 2 | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	319	324
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	319	324
Grades 1 and 2 | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	2,850	2,881
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	2,850	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	1,007	1,028
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,007	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	1,007	1,028
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,007	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	422,735	434,201
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	422,735	434,201
Grades 4 and 5 – pass | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	51,187	53,843
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	51,187	53,843
Grades 4 and 5 – pass | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	220,041	222,970
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	220,041	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	103,049	97,132
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	103,049	97,132
Grades 4 and 5 – pass | Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	48,458	60,256
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	48,458	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	6,118	2,228
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	6,118	2,228
Grade 6 – special mention | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	1,507	48
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,507	48
Grade 6 – special mention | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	1,701	2,180
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,701	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	2,910	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	2,910	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	16,279	15,628
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	16,279	15,628
Grade 7 – substandard | Commercial and Industrial
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	2,132	2,763
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	2,132	2,763
Grade 7 – substandard | Commercial Real Estate
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	1,926	389
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,926	389
Grade 7 – substandard | Real Estate Construction and Development Loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	11,562	11,663
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	11,562	11,663
Grade 7 – substandard | Agricultural
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	659	813
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	659	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	108,774	120,853
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	108,774	120,853
Not graded | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	40,038	49,563
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	40,038	49,563
Not graded | Home Improvement and Home Equity
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	201	300
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	201	300
Not graded | Total installment and student loans
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	68,535	70,990
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	68,535	70,990
Pass
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	14,047	9,987
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	14,047	9,987
Pass | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	13,153	9,186
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	13,153	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	874	780
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	874	780
Special mention
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	1,091	470
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	1,091	470
Special mention | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	750	470
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	750	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	341	0
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	341	0
Substandard
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	201	253
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	201	253
Substandard | Residential mortgages
Credit Risk Ratings For Commercial, Construction, And Other Non-Consumer Related Loans [Abstract]
Total	201	212
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	201	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	0	41
Credit Risk Ratings For Consumer Related Loans And Other Homogenous Loans [Abstract]
Total	0	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, Credit Quality Indicator [Line Items]
Notes receivable, period of loss recognition	3 years
Maximum | Grades 4 and 5 – pass
Financing Receivable, Credit Quality Indicator [Line Items]
Notes receivable, period of loss recognition	4 years