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Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2022
Quarterly Financial Information Disclosure [Abstract]
Retroactive equity adjustment		$ 10.1
Adjustment to earnings (net of tax)	$ 1.7

X

- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

No definition available.

+ Details

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X

- Definition

Retroactive equity adjustment.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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