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RESTRUCTURING - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Mar. 31, 2018	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Restructuring expense	$ 8,505	$ 9,100
Outstanding unpaid accrued liabilities	$ 7,002	$ 202	$ 161	$ 0

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- Definition

Restructuring Charges and Disposal Group, Including Discontinued Operation, Restructuring Charges

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No definition available.

+ Details

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- Definition

Restructuring Reserve and Disposal Group, Including Discontinued Operations, Restructuring Reserve

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No definition available.

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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