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OTHER REAL ESTATE OWNED - Activities in Other Real Estate Owned (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other Real Estate and Foreclosed Assets [Roll Forward] |  |  |  |
Balance at beginning of period | $ 710 | $ 3,267 | $ 1,796 | $ 2,502
Additions | 0 | 1,265 | 434 | 3,068
Sales and net direct write-downs | (327) | (716) | (2,038) | (1,751)
Net change in valuation allowance | 51 | (134) | 242 | (137)
Balance at end of period | $ 434 | $ 3,682 | $ 434 | $ 3,682

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- Definition Additions to other real estate and foreclosed assets. + References No definition available. + Details
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- Definition Sales and net direct write-downs of other real estate and foreclosed assets. + References No definition available. + Details
Name: | banc_OtherRealEstateAndForeclosedAssetsDisposals
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
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- Definition Other Real Estate and Foreclosed Assets [Roll Forward] + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Total Increase or Decrease in the real estate owned valuation allowance for period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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