Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial Assets:
Securities available for sale	$ 159,282	$ 184,791
Amortized Cost [Member]
Financial Assets:
Cash and due from banks	21,987	21,779
Interest-bearing deposits	8,687	3,970
Securities available for sale	159,282	209,480
Federal Home Loan Bank stock	4,428	4,428
Loans held for sale	1,873	1,094
Loans receivable	663,821	604,286
Accrued interest receivable	3,390	3,799
Financial liabilities:
Deposits	726,914	732,882
Advances from borrowers for taxes and insurance	1,433	766
Advances from Federal Home Loan Bank	33,000	11,000
Repurchase agreements	42,043	47,655
Subordinated debentures	10,310	10,310
Estimated Fair Value [Member]
Financial Assets:
Cash and due from banks	21,987	21,779
Interest-bearing deposits	8,627	3,970
Securities available for sale	159,282	209,480
Federal Home Loan Bank stock	4,428	4,428
Loans held for sale	1,873	1,094
Loans receivable	633,187	593,257
Accrued interest receivable	3,390	3,799
Financial liabilities:
Deposits	725,466	732,942
Advances from borrowers for taxes and insurance	1,433	766
Advances from Federal Home Loan Bank	32,772	10,979
Repurchase agreements	42,043	47,655
Subordinated debentures	10,310	10,099
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets:
Cash and due from banks	21,987	21,779
Interest-bearing deposits	8,627	3,970
Securities available for sale		2,001
Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Securities available for sale	159,282	205,662
Loans held for sale	1,873	1,094
Financial liabilities:
Deposits	725,466	732,942
Advances from borrowers for taxes and insurance	1,433	766
Advances from Federal Home Loan Bank	32,772	10,979
Repurchase agreements	42,043	47,655
Significant Unobservable Inputs (Level 3) [Member]
Financial Assets:
Securities available for sale		1,817
Federal Home Loan Bank stock	4,428	4,428
Loans receivable	633,187	593,257
Accrued interest receivable	3,390	3,799
Financial liabilities:
Subordinated debentures	$ 10,310	$ 10,099

Accrued interest receivable fair value disclosure.

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Interest bearing deposits in federal home loan bank fair value disclosure.

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Fair value of Federal Home Loan Bank (FHLBank) advances carried under the fair value option.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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 portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

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

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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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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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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