Loans and Allowance for Loan Losses - Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Aging of the recorded investment in past due loans
Total Past Due	$ 487	$ 150
Current	377,435	371,394
Loans and Leases Receivable, Gross, Total	377,922	371,544
Commercial
Aging of the recorded investment in past due loans
Loans and Leases Receivable, Gross, Total	64,710	61,551
Commercial Real Estate
Aging of the recorded investment in past due loans
Loans and Leases Receivable, Gross, Total	220,878	217,629
Residential Real Estate
Aging of the recorded investment in past due loans
Loans and Leases Receivable, Gross, Total	89,061	88,797
Consumer
Aging of the recorded investment in past due loans
Loans and Leases Receivable, Gross, Total	3,273	3,567
Commercial \| Commercial
Aging of the recorded investment in past due loans
Total Past Due	156	11
Current	64,554	61,540
Loans and Leases Receivable, Gross, Total	64,710	61,551
Real estate \| Residential Real Estate
Aging of the recorded investment in past due loans
Total Past Due	214	134
Current	88,847	88,663
Loans and Leases Receivable, Gross, Total	89,061	88,797
Construction \| Commercial Real Estate
Aging of the recorded investment in past due loans
Current	41,186	36,829
Loans and Leases Receivable, Gross, Total	41,186	36,829
Auto \| Consumer
Aging of the recorded investment in past due loans
Current	837	841
Loans and Leases Receivable, Gross, Total	837	841
Other \| Commercial Real Estate
Aging of the recorded investment in past due loans
Total Past Due	117
Current	179,575	180,800
Loans and Leases Receivable, Gross, Total	179,692	180,800
Other \| Consumer
Aging of the recorded investment in past due loans
Total Past Due		5
Current	2,436	2,721
Loans and Leases Receivable, Gross, Total	2,436	2,726
30 to 59 Days Past Due
Aging of the recorded investment in past due loans
Total Past Due	326	5
30 to 59 Days Past Due \| Commercial \| Commercial
Aging of the recorded investment in past due loans
Total Past Due	156
30 to 59 Days Past Due \| Real estate \| Residential Real Estate
Aging of the recorded investment in past due loans
Total Past Due	53
30 to 59 Days Past Due \| Other \| Commercial Real Estate
Aging of the recorded investment in past due loans
Total Past Due	117
30 to 59 Days Past Due \| Other \| Consumer
Aging of the recorded investment in past due loans
Total Past Due		5
60 to 89 Days Past Due
Aging of the recorded investment in past due loans
Total Past Due	74	48
60 to 89 Days Past Due \| Commercial \| Commercial
Aging of the recorded investment in past due loans
Total Past Due		11
60 to 89 Days Past Due \| Real estate \| Residential Real Estate
Aging of the recorded investment in past due loans
Total Past Due	74	37
Over 90 Days Past Due
Aging of the recorded investment in past due loans
Total Past Due	87	97
Over 90 Days Past Due \| Real estate \| Residential Real Estate
Aging of the recorded investment in past due loans
Total Past Due	$ 87	$ 97

Financing receivables that are current.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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Recorded Investment in financing receivables that are past due at the balance sheet date.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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