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SERVICING RIGHTS - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Transfers and Servicing [Abstract]
Income earned on mortgage servicing rights	$ (5,288)	$ (442)
Loss on fair values of servicing rights	10,200	2,500
Revenue earned on mortgage servicing rights	4,900	$ 2,000
Unpaid principal balance	5,440,000		$ 4,770,000
Escrow balances	$ 18,900		$ 21,100
Discount rate	7.50%
Prepayment speed	7.50%

X

- Definition

Bank Servicing Fees, Gross

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Continuing Involvement with Derecognized Transferred Financial Assets, Recorded Escrow Balance

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
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X

- Definition

Servicing Asset at Amortized Cost, Discount Rate

+ References

No definition available.

+ Details

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X

- Definition

Servicing Asset at Amortized Cost, Prepayment Speed Calculation, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	banc_
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X

- Definition

Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719

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X

- Definition

The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(6),(7)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746

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X

- Definition

Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13 (d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- References

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