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Fair Value Option (Details 1) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value Election [Abstract]
Other Borrowings, Fair Value Disclosure	$ 115,022	$ 118,838
Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value	$ 1,150	$ 301

X

- Definition

Aggregate Unpaid Principal Balance in Excess of (Less Than) Fair Value

+ References

No definition available.

+ Details

Name:	banc_AggregateUnpaidPrincipalBalanceInExcessOfLessThanFairValue
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair Value Election

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No definition available.

+ Details

Name:	banc_FairValueElectionAbstract
Namespace Prefix:	banc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Other Borrowings, Fair Value Disclosure

+ References

No definition available.

+ Details

Name:	banc_OtherBorrowingsFairValueDisclosure
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant