Loans and Lease Receivables and Allowance for Credit Losses - Summary of Minimum Annual Lease Payments for Lease Financing Receivables (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Receivables [Abstract]
2024	$ 205,973
2025	183,204
2026	136,621
2027	82,425
2028	32,524
Thereafter	3,760
Total	$ 644,507

Finance leases future minimum payments receivable.

No definition available.

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Period Type:	instant

Finance leases future minimum payments receivable in due thereafter.

No definition available.

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

Finance leases future minimum payments receivable in five years.

No definition available.

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

Finance leases future minimum payments receivable in four years.

No definition available.

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

Finance leases future minimum payments receivable in next twelve months.

No definition available.

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

Finance leases future minimum payments receivable in three years.

No definition available.

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

Finance leases future minimum payments receivable in two years.

No definition available.

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

No definition available.

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