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Fair Value Measurement - Additional Information (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Fair value, assets, to or from level 3 transfers, amount	$ 0	$ 0
Fair value, equity, to or from level 3 transfers, amount	$ 0	$ 0

X

- Definition

Fair value assets to or from level three transfers amount.

+ References

No definition available.

+ Details

Name:	by_FairValueAssetsToOrFromLevelThreeTransfersAmount
Namespace Prefix:	by_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- References

No definition available.

+ Details

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