Fair Value Measurements and Disclosures - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial Assets:
Cash and due from banks	$ 39,087	$ 17,191
Available for sale securities	222,119	222,110
Held to maturity securities	54,632	54,598
Held to maturity securities, fair value	54,512	53,459
Other investments	2,751	2,811
Other investments, Fair Value	2,751	2,811
Federal Home Loan Bank stock	2,077	2,069
Federal Home Loan Bank stock, Fair Value	2,077	2,069
Loans, net	262,116	268,006
Loans, net, Fair Value	254,111	260,560
Other real estate	8,873	8,943
Other real estate, Fair Value	8,873	8,943
Cash surrender value of life insurance	18,982	18,841
Cash surrender value of life insurance, Fair Value	18,982	18,841
Deposits:
Non-interest bearing	130,184	114,512
Non-interest bearing, Fair Value	130,184	114,512
Interest bearing, Fair Value	391,727	359,386
Borrowings from Federal Home Loan Bank	1,068	36,142
Borrowings from Federal Home Loan Bank, Fair Value	1,245	36,211
Carrying Amount [Member]
Financial Assets:
Cash and due from banks	39,087	17,191
Available for sale securities	222,119	222,110
Held to maturity securities	54,632	54,598
Other investments	2,751	2,811
Federal Home Loan Bank stock	2,077	2,069
Loans, net	262,116	268,006
Other real estate	8,873	8,943
Cash surrender value of life insurance	18,982	18,841
Deposits:
Non-interest bearing	130,184	114,512
Interest bearing	391,153	358,994
Borrowings from Federal Home Loan Bank	1,068	36,142
Level 1 [Member]
Financial Assets:
Cash and due from banks	39,087	17,191
Other investments, Fair Value	2,751	2,811
Deposits:
Non-interest bearing, Fair Value	130,184	114,512
Level 2 [Member]
Financial Assets:
Available for sale securities	222,119	222,110
Held to maturity securities, fair value	54,512	53,459
Federal Home Loan Bank stock, Fair Value	2,077	2,069
Cash surrender value of life insurance, Fair Value	18,982	18,841
Deposits:
Borrowings from Federal Home Loan Bank, Fair Value	1,245	36,211
Level 3 [Member]
Financial Assets:
Loans, net, Fair Value	254,111	260,560
Other real estate, Fair Value	8,873	8,943
Deposits:
Non-interest bearing, Fair Value	$ 391,727
Interest bearing, Fair Value		$ 359,386

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Noninterest bearing deposit liabilities domestic fair value disclosure.

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Other investments fair value disclosure.

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Real estate acquired through foreclosure fair value disclosure.

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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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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Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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Amount of investments classified as other.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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