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DEPOSITS - Summary of Brokered Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Interest-bearing demand deposits	$ 0	$ 0
Money market accounts	10,000	10,000
Certificates of deposit of $250,000 or less	16,223	0
Certificates of deposit of more than $250,000	0	0
Total brokered deposits	$ 26,223	$ 10,000

X

- Definition

Interest-bearing Domestic Deposit, Demand, Brokered

+ References

No definition available.

+ Details

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

X

- Definition

Interest-bearing Domestic Deposit, Money Market, Brokered

+ References

No definition available.

+ Details

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

X

- Definition

Time Deposits, $250,000 Or More, Brokered

+ References

No definition available.

+ Details

Name:	banc_TimeDeposits250000OrMoreBrokered
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Time Deposits, Less than $250,000, Brokered

+ References

No definition available.

+ Details

Name:	banc_TimeDepositsLessthan250000Brokered
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant