XML 154 R142.htm IDEA: XBRL DOCUMENT v3.25.0.1

Regulatory Capital Requirements - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital Ratios Description	The ratios above reflect the Company’s election to opt into the regulators’ joint CECL transition provision, which allows the Company to phase in the capital impact of the adoption of CECL over the next three years beginning January 1, 2022. Accordingly, capital ratios reflect 75% of the CECL impact as of December 31, 2024, 50% as of December 31, 2023, and 25% as of December 31, 2022. As of January 1, 2025, the capital impact of the adoption of CECL is fully phased in.
Bank | O 2024 A Dividends
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Proceeds from Dividends Received	$ 46.0
Bank | O 2023 A Dividends
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Proceeds from Dividends Received		$ 35.0
Federal Deposit Corporation And Federal Reserve Board
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer above the minimum capital requirements	7.20%
Federal Deposit Corporation And Federal Reserve Board | Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer above the minimum capital requirements	8.44%
Federal Deposit Corporation And Federal Reserve Board | Rules Phased in beginning January 2016
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Additional capital conservation buffer requirement subsequent years ratio	2.50%

X

- Definition

The additional capital conservation buffer ratio requirement in subsequent years.

+ References

No definition available.

+ Details

Name:	by_AdditionalCapitalConservationBufferRequirementSubsequentYearsRatio
Namespace Prefix:	by_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Capital conservation buffer above the minimum capital requirements.

+ References

No definition available.

+ Details

Name:	by_CapitalConservationBufferAboveTheMinimumCapitalRequirements
Namespace Prefix:	by_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Capital ratios description.

+ References

No definition available.

+ Details

Name:	by_CapitalRatiosDescription
Namespace Prefix:	by_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

+ Details

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

X

- Definition

Dividends received on equity and other investments during the current period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-16

+ Details

Name:	us-gaap_ProceedsFromDividendsReceived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=by_O2024ADividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=by_O2023ADividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RegulatoryAgencyAxis=by_FederalDepositCorporationAndFederalReserveBoardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=by_RulesEffective2016January1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: