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LEASES - Components of Lease Expense and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 18, 2021
Lessee, Lease, Description [Line Items]
Operating lease expense			$ 9,168	$ 6,972	$ 6,024
Variable lease expense			168	366	279
Total lease expense			9,336	7,338	6,303
Operating cash flows			9,515	7,229	6,812
ROU assets obtained in exchange for lease liabilities	$ 107	$ 811	$ 2,060	26,413	$ 3,289
PMBC
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets				$ 9,200		$ 9,212

X

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed Operating Lease Right-of-use Assets

+ References

No definition available.

+ Details

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

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

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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

No definition available.

+ Details

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Publisher FASB
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-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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X

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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X

- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

+ References

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- Details

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