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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchases, Sales, and Transfers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers from Held-For-Sale	$ 0	$ 0
Transfers (to) Held-For-Sale	(6,546)	(243,093)
Commercial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers from Held-For-Sale	0	0
Transfers (to) Held-For-Sale	0	(6,583)
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers from Held-For-Sale	0	0
Transfers (to) Held-For-Sale	(2,184)	(236,510)
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers from Held-For-Sale	0	0
Transfers (to) Held-For-Sale	$ (4,362)	$ 0

X

- Definition

Financing Receivable, Reclassification From Held-for-sale

+ References

No definition available.

+ Details

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

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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Namespace Prefix:	us-gaap_
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X

- Definition

The amount of financing receivables reclassified to held for sale during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Details

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- Details

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- Details

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- Details

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- Details

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