Retirement Plans - Summary of Shares Allocations are Accounted For Fair Value on The Date of Allocations (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Number of ESOP shares allocated	35,725	9,473
Number of ESOP shares committed to be released	6,531	24,359
Total number of ESOP allocated and committed-to-be-released	42,256	33,832
Number of non committed, unearned ESOP shares	640,244	648,668
Total number of ESOP shares	682,500	682,500
Fair value of ESOP allocated shares	$ 242,576	$ 64,320
Fair value of ESOP Committed-to-be released shares	41,208	157,118
Total fair value of ESOP allocated and committed-to-be-released	283,784	221,438
Fair value of ESOP unallocated shares	4,039,939	4,183,908
Total fair value of ESOP shares	$ 4,323,723	$ 4,405,346

Employee stock ownership plan ESOP allocated shares and committed to be released fair value.

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- Definition

Employee stock ownership plan esop allocated shares fair value.

+ References

No definition available.

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- Definition

Employee stock ownership plan esop number of allocated shares and committed to be released shares.

+ References

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- Definition

Employee stock ownership plan ESOP shares committed to be released fair value

+ References

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- Definition

Employee stock ownership plan ESOP shares fair value.

+ References

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- Definition

Fair value of unearned shares held by the employee stock ownership plan (ESOP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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- Definition

The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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- Definition

The shares that, although not legally released, will be released by a future scheduled and committed debt service payment and will be allocated to employees for service rendered in the current accounting period. The ESOP documents typically define the period of service to which the shares relate. ESOP shares are released to compensate employees directly, to settle employer liabilities for other employee benefits, and to replace dividends on allocated shares that are used for debt service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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- Definition

Shares contributed to the ESOP that have not yet been released, committed to be released, or allocated to participant accounts. Suspense shares generally collateralize ESOP debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

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