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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Commitments to extend credit
Other Commitments [Line Items]
Fixed Rate	$ 2,637	$ 74,777
Variable Rate	264,592	201,321
Commitments to extend credit | Banc Home Loan | Discontinued Operations
Other Commitments [Line Items]
Commitments to extend credit	0	65,100
Unused lines of credit
Other Commitments [Line Items]
Fixed Rate	46,421	27,151
Variable Rate	1,267,848	888,236
Letters of credit
Other Commitments [Line Items]
Fixed Rate	1,772	1,784
Variable Rate	$ 7,494	$ 8,655

X

- Definition

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

+ References

No definition available.

+ Details

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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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