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LOANS, ALLOWANCE FOR LOAN LOSSES, AND CREDIT QUALITY - Collateral dependent loans (Details) $ in Thousands	Sep. 30, 2023 USD ($)
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Without an Allowance	$ 1,672
With an Allowance	13,781
Allowance Allocation	4,773
Total
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	15,453
Real Estate
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	9,734
Other Business Assets
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	5,719
Commercial/Industrial
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Without an Allowance	47
With an Allowance	5,672
Allowance Allocation	1,919
Commercial/Industrial | Total
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	5,719
Commercial/Industrial | Other Business Assets
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	5,719
Commercial Real Estate - Owner Occupied
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Without an Allowance	1,590
With an Allowance	8,109
Allowance Allocation	2,854
Commercial Real Estate - Owner Occupied | Total
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	9,699
Commercial Real Estate - Owner Occupied | Real Estate
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	9,699
Residential 1-4 Family
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Without an Allowance	35
Residential 1-4 Family | Total
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	35
Residential 1-4 Family | Real Estate
LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY
Collateral dependent loans	$ 35

X

- Definition

Amount of valuation allowance for collateral dependent loans that are expected to be uncollectible.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The balance of financing receivables that were dependent on collateral. A loan is considered to be collateral dependent when, based upon management's assessment, the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral.

+ References

No definition available.

+ Details

Name:	bfc_FinancingReceivableCollateralDependentLoans
Namespace Prefix:	bfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The balance of financing receivables that were dependent on collateral with an allowance for credit losses.

+ References

No definition available.

+ Details

Name:	bfc_FinancingReceivableCollateralDependentLoansWithAllowanceForCreditLoss
Namespace Prefix:	bfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The balance of financing receivables that were dependent on collateral without an allowance for credit losses.

+ References

No definition available.

+ Details

Name:	bfc_FinancingReceivableCollateralDependentLoansWithoutAllowanceForCreditLoss
Namespace Prefix:	bfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

+ Details

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

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_CollateralPledgedMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
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X

- Details

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X

- Details

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