Fair Value - Estimated Fair Values of Financial Instruments (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loans held for sale	$ 2,143,000	$ 2,143,000
Pension plan asset	14,963,000	15,038,000
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	9,496	11,716
Investment securities	29,668	52,690
Loans held for sale	2,143	2,143
Loans receivable, net	732,520	642,148
Accrued interest receivable	2,917	2,707
FHLB stock	1,288	964
Demand deposits	91,060	78,792
Interest-bearing deposits	205,816	195,565
Certificates of deposit	405,530	368,721
Advance payments by borrowers for taxes and insurance	4,661	3,882
Advances from FHLB	8,000	3,000
Accrued interest payable	31	28
Fair Value Measurements
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	9,496	11,716
Investment securities	29,668	52,690
Loans held for sale	2,143	2,143
Loans receivable, net	748,928	660,706
Accrued interest receivable	2,917	2,707
FHLB stock	1,288	964
Pension plan asset	14,963	15,038
Demand deposits	91,060	78,792
Interest-bearing deposits	205,816	195,565
Certificates of deposit	411,406	368,721
Advance payments by borrowers for taxes and insurance	4,661	3,882
Advances from FHLB	8,000	3,000
Accrued interest payable	31	28
Fair Value Measurements \| Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	9,496	11,716
FHLB stock	1,288	964
Demand deposits	91,060	78,792
Interest-bearing deposits	205,816	195,565
Advances from FHLB	8,000	3,000
Fair Value Measurements \| Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Investment securities	29,668	52,690
Loans held for sale	2,143	2,143
Accrued interest receivable	2,917	2,707
Pension plan asset	14,963	15,038
Certificates of deposit	411,406	368,721
Advance payments by borrowers for taxes and insurance	4,661	3,882
Accrued interest payable	31	28
Fair Value Measurements \| Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loans receivable, net	$ 748,928	$ 660,706

Accrued interest payable fair value.

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Accrued interest receivable fair value.

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Advance payments by borrowers for taxes and insurance fair value.

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Certificates of deposit fair value.

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Demand deposit liability fair value.

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Federal home loan bank stock fair value.

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Interest bearing deposit fair value.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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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.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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