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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Commitments to extend credit
Other Commitments [Line Items]
Fixed Rate	$ 1,345	$ 1,851
Variable Rate	364,583	335,654
Commitments to extend credit | Banc Home Loan | Discontinued Operations
Other Commitments [Line Items]
Commitments to extend credit	0	0
Unused lines of credit
Other Commitments [Line Items]
Fixed Rate	11,082	19,085
Variable Rate	1,273,908	1,309,170
Letters of credit
Other Commitments [Line Items]
Fixed Rate	1,066	1,050
Variable Rate	$ 9,136	$ 12,976

X

- Definition

Disposal Group, Including Discontinued Operations, Other Commitments, Off-Balance Sheet Risk

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Other Commitments, Off-Balance Sheet Risk, Fixed Rate Financial Instrument

+ References

No definition available.

+ Details

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

X

- Definition

Other Commitments, Off-Balance Sheet Risk, Variable Rate Financial Instrument

+ References

No definition available.

+ Details

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

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

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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