Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financial Assets:
Securities available for sale	$ 237,829	$ 237,177
Financial liabilities:
Repurchase agreements	40,900
Amortized Cost [Member]
Financial Assets:
Cash and due from banks	27,393	46,926
Interest-earning deposits	14,798	7,772
Securities available for sale	237,829	237,177
Federal Home Loan Bank stock	4,428	4,428
Loans held for sale	1,339	2,792
Loans receivable	554,727	556,349
Accrued interest receivable	3,871	4,139
Financial liabilities:
Deposits	724,953	739,406
Advances from borrowers for taxes and insurance	754	614
Advances from Federal Home Loan Bank	11,000	15,000
Repurchase agreements	46,940	45,770
Subordinated debentures	10,310	10,310
Estimated Fair Value [Member]
Financial Assets:
Cash and due from banks	27,393	46,926
Interest-earning deposits	14,798	7,772
Securities available for sale	237,829	237,177
Federal Home Loan Bank stock	4,428	4,428
Loans held for sale	1,339	2,792
Loans receivable	550,201	552,981
Accrued interest receivable	3,871	4,139
Financial liabilities:
Deposits	711,263	724,877
Advances from borrowers for taxes and insurance	754	614
Advances from Federal Home Loan Bank	10,976	14,985
Repurchase agreements	47,043	45,931
Subordinated debentures	10,099	10,099
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets:
Cash and due from banks	27,393	46,926
Interest-earning deposits	14,798	7,772
Securities available for sale	2,005	2,000
Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Securities available for sale	233,850	233,312
Federal Home Loan Bank stock	4,428	4,428
Loans held for sale	1,339	2,792
Accrued interest receivable	3,871	4,139
Financial liabilities:
Deposits	711,263	724,877
Advances from borrowers for taxes and insurance	754	614
Advances from Federal Home Loan Bank	10,976	14,985
Repurchase agreements	47,043	45,931
Significant Unobservable Inputs (Level 3) [Member]
Financial Assets:
Securities available for sale	1,974	1,865
Loans receivable	550,201	552,981
Financial liabilities:
Subordinated debentures	$ 10,099	$ 10,099

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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 and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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

No definition available.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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