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DEPOSITS - Summary of Brokered Deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Deposits [Abstract] |  |
Interest-bearing demand deposits | $ 8,751 | $ 8,587
Money market accounts | 532,047 | 1,031,598
Certificates of deposit of $250,000 or less | 915,623 | 1,207,053
Certificates of deposit of more than $250,000 | 0 | 744
Total brokered deposits | $ 1,456,421 | $ 2,247,982

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- Definition Interest-bearing Domestic Deposit, Demand, Brokered + References No definition available. + Details
Name: | banc_InterestbearingDomesticDepositDemandBrokered
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest-bearing Domestic Deposit, Money Market, Brokered + References No definition available. + Details
Name: | banc_InterestbearingDomesticDepositMoneyMarketBrokered
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Time Deposits, $250,000 Or More, Brokered + References No definition available. + Details
Name: | banc_TimeDeposits250000OrMoreBrokered
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Time Deposits, Less than $250,000, Brokered + References No definition available. + Details
Name: | banc_TimeDepositsLessthan250000Brokered
Namespace Prefix: | banc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
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Period Type: | duration

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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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