Loans - Delinquent Loans (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) payment	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	$ 10,866	$ 12,355
Current Loans	638,788	585,019
Total Loans	649,654	597,374	$ 573,421
Accruing Loans 90 or More Days Past Due	$ 269	386
Minimum period of default	90 days
Number of monthly payments to demonstrate repayment ability | payment	6
Undisbursed commitments	$ 0	0
Total nonaccrual Loans	11,623	11,697
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	643
Current Loans	68,230	44,635
Total Loans	68,230	45,278	55,145
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	0	75
Commercial and Industrial | Commercial and business loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	643
Current Loans	41,525	43,891
Total Loans	41,525	44,534	54,334
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	0	75
Commercial and Industrial | Government program loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	26,705	744
Total Loans	26,705	744	811
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	0	0
Real estate mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,009	28
Current Loans	313,429	291,209
Total Loans	314,438	291,237	281,888
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	0	0
Real estate mortgage | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,009	0
Current Loans	263,483	245,183
Total Loans	264,492	245,183	227,525
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	0	0
Real estate mortgage | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	28
Current Loans	49,826	45,853
Total Loans	49,826	45,881	54,142
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	0	0
Real estate mortgage | Home improvement and home equity loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	120	173
Total Loans	120	173	221
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	0	0
Real estate construction and development
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	8,573	8,825
Current Loans	145,082	129,959
Total Loans	153,655	138,784	114,611
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	11,109	11,478
Agricultural loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	514	1,524
Current Loans	48,465	50,673
Total Loans	48,979	52,197	52,027
Accruing Loans 90 or More Days Past Due	0	0
Total nonaccrual Loans	514	144
Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	770	1,335
Current Loans	63,582	68,543
Total Loans	64,352	69,878	$ 69,750
Accruing Loans 90 or More Days Past Due	269	386
Total nonaccrual Loans	0	0
Installment and student loans | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	770	1,335
Current Loans	63,328	68,280
Total Loans	64,098	69,615
Accruing Loans 90 or More Days Past Due	269	386
Installment and student loans | Overdraft protection lines
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	30	33
Total Loans	30	33
Accruing Loans 90 or More Days Past Due	0	0
Installment and student loans | Overdrafts
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	224	230
Total Loans	224	230
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	209	1,845
Loans 30-60 Days Past Due | Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	568
Loans 30-60 Days Past Due | Commercial and Industrial | Commercial and business loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	568
Loans 30-60 Days Past Due | Commercial and Industrial | Government program loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Real estate mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	28
Loans 30-60 Days Past Due | Real estate mortgage | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Real estate mortgage | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	28
Loans 30-60 Days Past Due | Real estate mortgage | Home improvement and home equity loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Real estate construction and development
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	0	957
Loans 30-60 Days Past Due | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	209	292
Loans 30-60 Days Past Due | Installment and student loans | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	209	292
Loans 30-60 Days Past Due | Installment and student loans | Overdraft protection lines
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 30-60 Days Past Due | Installment and student loans | 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	1,301	1,080
Loans 61-89 Days Past Due | Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Commercial and Industrial | Commercial and business loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Commercial and Industrial | Government program loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Real estate mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,009	0
Loans 61-89 Days Past Due | Real estate mortgage | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	1,009	0
Loans 61-89 Days Past Due | Real estate mortgage | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Real estate mortgage | Home improvement and home equity loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Real estate construction and development
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	423
Loans 61-89 Days Past Due | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	292	657
Loans 61-89 Days Past Due | Installment and student loans | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	292	657
Loans 61-89 Days Past Due | Installment and student loans | Overdraft protection lines
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 61-89 Days Past Due | Installment and student loans | 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	9,356	9,430
Loans 90 or More Days Past Due | Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	75
Loans 90 or More Days Past Due | Commercial and Industrial | Commercial and business loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	75
Loans 90 or More Days Past Due | Commercial and Industrial | Government program loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Real estate mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Real estate mortgage | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Real estate mortgage | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Real estate mortgage | 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 | Real estate construction and development
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	8,573	8,825
Loans 90 or More Days Past Due | Agricultural loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	514	144
Loans 90 or More Days Past Due | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	269	386
Loans 90 or More Days Past Due | Installment and student loans | Installment and student loans
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	269	386
Loans 90 or More Days Past Due | Installment and student loans | Overdraft protection lines
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Days Past Due | Installment and student loans | Overdrafts
Financing Receivable, Past Due [Line Items]
Total Past Due Loans	$ 0	$ 0