Change in Corporate Structure (Details) $ / shares in Units, $ in Millions	Jul. 12, 2017 USD ($) $ / shares shares
Change In Corporate Form [Line Items]
Stock issued price per share on mutual-to-stock conversion \| $ / shares	$ 10.00
Numbers of shares issued upon bank's mutual to stock conversion \| shares	1,653,125
ESOP
Change In Corporate Form [Line Items]
Conversion and issuance cost of capital stock \| $	$ 1.1
Percentage of common stock subscribed in offering	8.00%

Number of new stock issued during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration