Fair Value Measurements - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
U.S. Agency securities	$ 6,326
Small Business Administration loan pools	6,554	$ 7,994
Obligations of state and political subdivisions	49,918	52,059
Mortgage backed securities	59,950	65,394
Total	122,748	125,447
Fair Value, Inputs, Level 1 [Member]
Assets:
U.S. Agency securities	0
Small Business Administration loan pools	0	0
Obligations of state and political subdivisions	0	0
Mortgage backed securities	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Assets:
U.S. Agency securities	6,326
Small Business Administration loan pools	6,554	7,994
Obligations of state and political subdivisions	49,918	52,059
Mortgage backed securities	59,950	65,394
Total	122,748	125,447
Fair Value, Inputs, Level 3 [Member]
Assets:
U.S. Agency securities	0
Small Business Administration loan pools	0	0
Obligations of state and political subdivisions	0	0
Mortgage backed securities	0	0
Total	$ 0	$ 0

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- Definition

Small business administration loan pools fair value disclosure.

+ References

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

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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- Definition

Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

+ References

No definition available.

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