Loans, Part II (Details)	6 Months Ended
	Jun. 30, 2019 USD ($) payment	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	$ 11,111,000	$ 9,515,000
Current Loans	562,310,000	578,418,000
Total Loans	573,421,000	587,933,000	$ 573,996,000
Accruing Loans 90 or More Days Past Due	$ 341,000	0
Minimum period of default	90 days
Number of monthly payments to demonstrate repayment ability | payment	6
Nonaccrual loans balances [Abstract]
Undisbursed commitments	$ 0	0
Total Loans	11,637,000	12,052,000
Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	75,000	0
Current Loans	55,070,000	56,978,000
Total Loans	55,145,000	56,978,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	75,000	0
Commercial and business loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	75,000	0
Current Loans	54,259,000	55,929,000
Total Loans	54,334,000	55,929,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	75,000	0
Government program loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	811,000	1,049,000
Total Loans	811,000	1,049,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	0	0
Total real estate mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,016,000	421,000
Current Loans	280,872,000	288,779,000
Total Loans	281,888,000	289,200,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	0	389,000
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,016,000	389,000
Current Loans	226,509,000	229,059,000
Total Loans	227,525,000	229,448,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	0	389,000
Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	32,000
Current Loans	54,142,000	59,399,000
Total Loans	54,142,000	59,431,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	0	0
Home improvement and home equity loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	221,000	321,000
Total Loans	221,000	321,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	0	0
Total installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,015,000	269,000
Current Loans	68,735,000	71,542,000
Total Loans	69,750,000	71,811,000
Accruing Loans 90 or More Days Past Due	341,000	0
Real Estate Construction and Development Loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	8,825,000	8,825,000
Current Loans	105,786,000	99,970,000
Total Loans	114,611,000	108,795,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	11,562,000	11,663,000
Agricultural loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	180,000	0
Current Loans	51,847,000	61,149,000
Total Loans	52,027,000	61,149,000
Accruing Loans 90 or More Days Past Due	0	0
Nonaccrual loans balances [Abstract]
Total Loans	0	0
Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,015,000	269,000
Current Loans	68,510,000	71,362,000
Total Loans	69,525,000	71,631,000
Accruing Loans 90 or More Days Past Due	341,000	0
Nonaccrual loans balances [Abstract]
Total Loans	0	0
Overdraft protection lines
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	35,000	41,000
Total Loans	35,000	41,000
Accruing Loans 90 or More Days Past Due	0	0
Overdrafts
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	190,000	139,000
Total Loans	190,000	139,000
Accruing Loans 90 or More Days Past Due	0	0
Loans 30-60 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,499,000	162,000
Loans 30-60 Days Past Due | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Commercial and business loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Government program loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Total real estate mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,016,000	32,000
Loans 30-60 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,016,000	0
Loans 30-60 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	32,000
Loans 30-60 Days Past Due | Home improvement and home equity loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Total installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	303,000	130,000
Loans 30-60 Days Past Due | Real Estate Construction and Development Loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Agricultural loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	180,000	0
Loans 30-60 Days Past Due | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	303,000	130,000
Loans 30-60 Days Past Due | Overdraft protection lines
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Overdrafts
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	446,000	139,000
Loans 61-89 Days Past Due | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	75,000	0
Loans 61-89 Days Past Due | Commercial and business loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	75,000	0
Loans 61-89 Days Past Due | Government program loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Total real estate mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Home improvement and home equity loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Total installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	371,000	139,000
Loans 61-89 Days Past Due | Real Estate Construction and Development Loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Agricultural loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	371,000	139,000
Loans 61-89 Days Past Due | Overdraft protection lines
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Overdrafts
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	9,166,000	9,214,000
Loans 90 or More Days Past Due | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Commercial and business loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Government program loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Total real estate mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	389,000
Loans 90 or More Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	389,000
Loans 90 or More Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Home improvement and home equity loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Total installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	341,000	0
Loans 90 or More Days Past Due | Real Estate Construction and Development Loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	8,825,000	8,825,000
Loans 90 or More Days Past Due | Agricultural loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	341,000	0
Loans 90 or More Days Past Due | Overdraft protection lines
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Overdrafts
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	$ 0	$ 0