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Derivatives and Hedging Activities - Schedule of Gain (Loss) of Derivatives (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives designated as hedges	$ (348)	$ (477)
(Loss) gain in OCI on derivatives (effective portion), net of tax	(137)	(107)
Gain (loss) reclassified from OCI into interest income or interest expense (effective portion)	$ (1,593)	$ (3,296)

X

- Definition

Gain (Loss) in OCI on Derivatives, Effective Portion, Net of Tax

+ References

No definition available.

+ Details

Name:	bbt_GainLossInOCIOnDerivativesEffectivePortionNetOfTax
Namespace Prefix:	bbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Gain (Loss) Reclassified From OCI Into Interest Income or Interest Expense, Effective Portion

+ References

No definition available.

+ Details

Name:	bbt_GainLossReclassifiedFromOCIIntoInterestIncomeOrInterestExpenseEffectivePortion
Namespace Prefix:	bbt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Net fair value of all derivative instruments designated as fair value hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B

+ Details

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