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LOANS AND ALLOWANCE FOR LOAN LOSSES - Accruing and Non-accrual Troubled Debt Restructurings (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Commitments to lend to clients with outstanding loans classified as TDRs	$ 135,000	$ 0
Accruing TDRs	6,600,000	5,700,000
Non-accrual TDRs	$ 15,200,000	$ 2,300,000

X

- Definition

Financing Receivable, Modifications, Recorded Investment, Accrual Status

+ References

No definition available.

+ Details

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

X

- Definition

Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18794-111554

+ Details

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Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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