Business Combination, Number of Branches

No definition available.

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed Deposit Liabilities

+ References

No definition available.

+ Details

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

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans and Leases Receivable

+ References

No definition available.

+ Details

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

- Definition

Payments to Acquire Businesses, Deposit Premiums Received

+ References

No definition available.

+ Details

Name:	banc_PaymentstoAcquireBusinessesDepositPremiumsReceived
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payments to Acquire Businesses, Net of Deposit Premiums Received

+ References

No definition available.

+ Details

Name:	banc_PaymentstoAcquireBusinessesNetofDepositPremiumsReceived
Namespace Prefix:	banc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
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- Details

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BUSINESS COMBINATIONS - Narrative (Details) (USD $)	0 Months Ended	12 Months Ended
BUSINESS COMBINATIONS - Narrative (Details) (USD $)	Nov. 08, 2014	Dec. 31, 2014	Mar. 31, 2015	Jan. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 31,591,000us-gaap_Goodwill	$ 31,591,000us-gaap_Goodwill
Banco Popular Branches
Business Acquisition [Line Items]
Number of branches	20
Payments to acquire businesses, deposit premiums received	3,900,000
Payments to acquire businesses, net of deposit premiums received	24,000,000
Loans and leases receivable	1,072,449,000
Deposit liabilities	1,076,614,000
Other intangible assets	15,777,000
Direct acquisition costs		4,300,000
Goodwill	0
Banco Popular Branches \| Core deposit intangibles
Business Acquisition [Line Items]
Other intangible assets	15,777,000
Amortization period of other intangible assets	10 years
Renovation Ready
Business Acquisition [Line Items]
Loans and leases receivable				0
Deposit liabilities				0
Other intangible assets				761,000
Goodwill				$ 2,239,000