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v3.20.1

Premises and Equipment and Assets Held For Sale - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item
Property Plant And Equipment [Abstract] |  |  |
Depreciation and amortization of premises and equipment | $ | $ 6,389 | $ 5,579 | $ 5,193
Number of branches closure | 2 | 6 | 2
Number of other Facilities |  | 2 |

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- Definition Number of facilities. + References No definition available. + Details
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Namespace Prefix: | by_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration