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Deposits (Narrative) (Details) $ in Thousands	Sep. 30, 2025 USD ($) item	Dec. 31, 2024 USD ($) item
Deposits [Abstract]
Percent of brokered deposits	0	4
Overdrawn deposit accounts reclassified as loans	$ 27	$ 70
Number of deposit relationships that exceed 5% | item	2	1
Deposit amount from relationship that exceeded 5%	$ 225,400	$ 97,000
Percent of total deposits from single deposit relationship	11.00%	5.00%

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- Definition

Deposit Amount From Relationship That Exceeded 5%

+ References

No definition available.

+ Details

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Namespace Prefix:	avbh_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Number Of Deposit Relationships That Exceed 5%

+ References

No definition available.

+ Details

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- Definition

Percent Of Brokered Deposits

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No definition available.

+ Details

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Namespace Prefix:	avbh_
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Balance Type:	na
Period Type:	instant

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- Definition

Percent Of Total Deposits From Single Deposit Relationship

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No definition available.

+ Details

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Namespace Prefix:	avbh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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- Definition

Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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