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Servicing Assets - Unpaid Principal Balances of Loans Serviced for Others (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	$ 1,712,892	$ 1,728,343
SBA guaranteed loans
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	1,522,389	1,530,401
USDA guaranteed loans
Loan portfolios serviced for:
Unpaid principal balances of loans serviced	$ 190,503	$ 197,942

X

- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Subparagraph (a)
-Paragraph 4
-SubTopic 20
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

Name:	us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=by_SBAGuaranteedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=by_USDAGuaranteedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: