Fair Value Measurements - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Small Business Administration loan pools	$ 1,084	$ 7,994
Obligations of state and political subdivisions	48,482	52,059
Mortgage backed securities	54,217	65,394
Total	103,783	125,447
Fair Value, Inputs, Level 1 [Member]
Assets:
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:
Small Business Administration loan pools	1,084	7,994
Obligations of state and political subdivisions	48,482	52,059
Mortgage backed securities	54,217	65,394
Total	103,783	125,447
Fair Value, Inputs, Level 3 [Member]
Assets:
Small Business Administration loan pools	0	0
Obligations of state and political subdivisions	0	0
Mortgage backed securities	0	0
Total	$ 0	$ 0

Obligations of state and political subdivisions fair value disclosure.

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

+ References

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