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Other Borrowings - Summary of Short-term Credit Lines Available for Use (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Federal Home Loan Bank Line |  |
Debt Instrument [Line Items] |  |
Short-term credit lines available for use | $ 1,910,295 | $ 2,016,212
Federal Reserve Bank of Chicago Discount Window Line |  |
Debt Instrument [Line Items] |  |
Short-term credit lines available for use | 622,306 | 874,677
Available Federal Funds Line |  |
Debt Instrument [Line Items] |  |
Short-term credit lines available for use | $ 115,000 | $ 115,000

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- Definition Short-term line of credit available for use. + References No definition available. + Details
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Namespace Prefix: | by_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=by_AvailableFederalFundsLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |