Supplementary Regulatory Capital Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Total Capital to risk-weighted assets, Actual Amount	$ 353,314	$ 316,129
Total Capital to risk-weighted assets, Actual, Ratio	12.61%	13.38%
Total Capital to risk-weighted assets, Minimum for Capital Adequacy Purposes Amount	$ 224,084	$ 188,991
Total Capital to risk-weighted assets, Minimum for Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total Capital to risk-weighted assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 280,104	$ 236,239
Total Capital to risk-weighted assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 Capital to average assets, Actual Amount	$ 335,847	$ 304,555
Tier 1 Capital to average assets, Actual, Ratio	10.93%	12.50%
Tier 1 Capital to average assets, Minimum for Capital Adequacy Purposes Amount	$ 122,925	$ 97,452
Tier 1 Capital to average assets, Minimum for Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Capital to average assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 153,656	$ 121,815
Tier 1 Capital to average assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provision, Ratio	5.00%	5.00%
Common equity to risk-weighted assets, Actual Amount	$ 335,847	$ 304,555
Common equity to risk-weighted assets, Actual, Ratio	11.99%	12.89%
Common equity to risk-weighted assets, Minimum for Capital Adequacy Purposes Amount	$ 126,047	$ 106,308
Common equity to risk-weighted assets, Minimum for Capital Adequacy Purposes, Ratio	4.50%	4.50%
Common equity to risk-weighted assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 182,068	$ 153,555
Common equity to risk-weighted assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Tier 1 Capital to risk-weighted assets, Actual Amount	$ 335,847	$ 304,555
Tier 1 Capital to risk-weighted assets, Actual, Ratio	11.99%	12.89%
Tier 1 Capital to risk-weighted assets, Minimum for Capital Adequacy Purposes Amount	$ 168,063	$ 141,743
Tier 1 Capital to risk-weighted assets, Minimum for Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 Capital to risk-weighted assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 224,084	$ 188,991
Tier 1 capital to risk-weighted assets, Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Ratio	8.00%	8.00%

The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

Name:	us-gaap_CapitalRequiredForCapitalAdequacy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826