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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Servicing Rights (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Servicing rights, held-for-sale, fair value	$ 29,793

X

- Definition

Servicing Asset at Fair Value, Amount, Held-For-Sale

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration