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Stock-Based Compensation - Summary of Restricted Stock Activity (Parenthetical) (Details)	3 Months Ended
	Jun. 30, 2021 shares
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted shares applicable tax withholding requirements	2,641

X

- Definition

Share based compensation arrangement by share based payment award tax withholding requirements.

+ References

No definition available.

+ Details

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

X

- 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.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: