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Loan and Lease Receivables - Summary of Minimum Annual Lease Payments for Lease Financing Receivables (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Receivables [Abstract]
2021	$ 27,875
2022	110,733
2023	85,005
2024	59,682
2025	39,328
Thereafter	14,889
Total	$ 337,512

X

- Definition

Finance leases future minimum payments receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Finance leases future minimum payments receivable in due thereafter.

+ References

No definition available.

+ Details

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

X

- Definition

Finance leases future minimum payments receivable in four years.

+ References

No definition available.

+ Details

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

X

- Definition

Finance leases future minimum payments receivable in next twelve months.

+ References

No definition available.

+ Details

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

X

- Definition

Finance leases future minimum payments receivable in three years.

+ References

No definition available.

+ Details

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

X

- Definition

Finance leases future minimum payments receivable in two years.

+ References

No definition available.

+ Details

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

X

- Definition

Finance leases future minimum payments receivable remainder of fiscal year.

+ References

No definition available.

+ Details

Name:	by_FinanceLeasesFutureMinimumPaymentsReceivableRemainderOfFiscalYear
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
Period Type:	duration