Loans - Summary of the Activity in Loans Classified as TDRs (Detail)	6 Months Ended	12 Months Ended
Jun. 30, 2018 USD ($) Contracts	Dec. 31, 2017 USD ($) Contracts
Non-Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| Contracts	2	2
Pre-Modification Outstanding Record Investment	$ 3,162,197	$ 3,163,435
Post Modification Outstanding Record Investment, net of related allowance	$ 3,162,197	$ 3,163,435
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| Contracts	1
Pre-Modification Outstanding Record Investment	$ 90,327
Post Modification Outstanding Record Investment, net of related allowance	$ 90,327

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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