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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Troubled Debt Restructurings Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 loan	Dec. 31, 2018 USD ($)
Receivables [Abstract]
Accruing TDRs	$ 5.6		$ 5.7
Nonaccruing TDRs	$ 1.9		$ 2.3
Number of loans modified that had payments default during the period | loan	0	0

X

- Definition

Financing Receivable, Modifications, Recorded Investment, Accrual Status

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status

+ References

No definition available.

+ Details

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

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

+ Details

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X

- References

No definition available.

+ Details

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