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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
Name: | by_CumulativeEffectOnRetainedEarningsNetOfTax2
Namespace Prefix: | by_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Retroactive equity adjustment. + References No definition available. + Details
Name: | by_RetroactiveEquityAdjustment
Namespace Prefix: | by_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration