Borrowings - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowing limit from federal reserve bank discount window primary credit program	$ 17,638,095
maturity date for credit rate	1 day
Outstanding Balance	$ 0
Amount Outstanding in advance	36,142,000	$ 11,198,000
Line of Credit with FHLB	72,623,426
Advance in Amount, One	$ 35,000,000
Margin on the fixed rate of interest	2.65%
Maturity year of advances	2019-12
Primary credit rate	3.00%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Earliest	2030
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Last	2040
First National Bankers Bank [Member] \| Revolving Credit Facility [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Unsecured revolving Line of credit	$ 500,000
Outstanding balance of line credit	$ 0
Term of line of credit	1 year
Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed rate of interest remaining advances, from	2.604%
Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed rate of interest remaining advances, from	7.00%

Advances from federal reserve bank.

No definition available.

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- Definition

Federal home loan bank advance branch of FHLB bank due date.

+ References

No definition available.

+ Details

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- Definition

Federal home loan bank advances by interest rate type fixed rate advance one.

+ References

No definition available.

+ Details

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- Definition

Federal home loan bank advances by interest rate type margin on fixed rate.

+ References

No definition available.

+ Details

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- Definition

Federal reserve bank advances maturity period.

+ References

No definition available.

+ Details

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- Definition

Percenatge represents primary credit rate.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing from federal reserve bank.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

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.

+ References

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- Definition

Discloses the earliest year of maturity for the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
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- Definition

Enter the last year of maturity for the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

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- Definition

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

+ References

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- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

+ Details

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- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is uncollateralized (where debt is not backed by the pledge of collateral).

+ References

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