Fair Value Measurement - Additional Information (Details) - USD ($)	Jun. 30, 2022	Jun. 30, 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

Fair value assets to or from level three transfers amount.

No definition available.

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