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Fair Value Measurement - Additional Information (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Fair value, equity, to or from level 3 transfers, amount	$ 0
Fair value liabilities to or from level 1 and level 2	$ 0	$ 0

X

- Definition

Fair value equity to or from level three transfers amount.

+ References

No definition available.

+ Details

Name:	by_FairValueEquityToOrFromLevelThreeTransfersAmount
Namespace Prefix:	by_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value liabilities to or from level1 and level 2

+ References

No definition available.

+ Details

Name:	by_FairValueLiabilitiesToOrFromLevel1AndLevel2
Namespace Prefix:	by_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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