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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 ($)
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Receivables [Abstract] |
2021 | $ 27,875
2022 | 110,733
2023 | 85,005
2024 | 59,682
2025 | 39,328
Thereafter | 14,889
Total | $ 337,512

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- 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

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- 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
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration