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Employee Stock Ownership Plan - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jan. 31, 2021	Dec. 31, 2020	Apr. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Note payable balance of ESOP	$ 5,600,000		$ 5,600,000		$ 3,000,000.0	$ 2,600,000	$ 3,000,000.0
Shares purchased by ESOP					225,721		295,499
ESOP expense	$ 71,000	$ 20,000	$ 193,000	$ 71,000
ESOP released shares	47,200		47,200			47,200

X

- Definition

Employee stock ownership plan ESOP number of released shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	afbi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount reported as a liability as of the balance sheet date by the entity (the employer) of the loan made by a third-party lender to the employer relating to loans made by the employer to the ESOP.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 25
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16545-113920

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X

- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

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