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Commitments and Contingent Liabilities - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2022
Commitments And Contingencies Liabilities [Line Items] |
Fixed rate loan commitments maturity year | 2045
Variable rate loan commitments maturity year | 2048
Maximum |
Commitments And Contingencies Liabilities [Line Items] |
Commitments to make loans period | 90 days
Loan commitments fixed interest rate | 18.00%
Loan commitments variable interest rate | 15.00%
Minimum |
Commitments And Contingencies Liabilities [Line Items] |
Loan commitments fixed interest rate | 1.25%
Loan commitments variable interest rate | 1.25%

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- Definition Commitments and contingencies liabilities. + References No definition available. + Details
Name: | by_CommitmentsAndContingenciesLiabilitiesLineItems
Namespace Prefix: | by_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fixed rate loan commitment period. + References No definition available. + Details
Name: | by_FixedRateLoanCommitmentPeriod
Namespace Prefix: | by_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Fixed rate loan commitments maturities ending year. + References No definition available. + Details
Name: | by_FixedRateLoanCommitmentsMaturitiesEndingYear
Namespace Prefix: | by_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Loan commitments bearing fixed interest rate, percentage. + References No definition available. + Details
Name: | by_LoanCommitmentsPercentageBearingFixedInterestRate
Namespace Prefix: | by_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Loan commitments bearing variable interest rate, percentage. + References No definition available. + Details
Name: | by_LoanCommitmentsPercentageBearingVariableInterestRate
Namespace Prefix: | by_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Variable rate loan commitments maturities ending year. + References No definition available. + Details
Name: | by_VariableRateLoanCommitmentsMaturitiesEndingYear
Namespace Prefix: | by_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |