Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-80

+ Details

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

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=avbh_PaymentDelayAndTermExtensionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Allowance For Credit Losses On Loans (Amortized Cost Basis Of Loans Experiencing Both Financial Difficulty And Modified) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 5,258	$ 3,906	$ 31,300	$ 23,797
Percent of Total Class	0.27%	0.22%	1.60%	1.33%
Term Extension [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		$ 3,906	$ 26,042	$ 19,474
Payment Delay And Term Extension [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 5,258		5,258	4,323
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		$ 3,906	$ 24,519	$ 15,148
Percent of Total Class		1.54%	11.66%	5.96%
Construction [Member] \| Term Extension [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		$ 3,906	$ 24,519	$ 15,148
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 5,258		$ 6,781	$ 8,649
Percent of Total Class	0.60%		0.78%	1.09%
Commercial And Industrial [Member] \| Term Extension [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total			$ 1,523	$ 4,326
Commercial And Industrial [Member] \| Payment Delay And Term Extension [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 5,258		$ 5,258	$ 4,323