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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 d banking_office
Accounting Policies [Abstract]
Number of banking offices | banking_office	29
Exchange ratio	0.50
Trading period used in the average price calculation | d	20

X

- Definition

Merger Agreement, Exchange Ratio

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
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Balance Type:	na
Period Type:	instant

X

- Definition

Merger Agreement, Trading Period

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
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Balance Type:	na
Period Type:	instant

X

- Definition

Number of offices included in Nature of Operations disclosure.

+ References

No definition available.

+ Details

Name:	banc_NumberOfBankingOffices
Namespace Prefix:	banc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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