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DEPOSITS - Summary of Brokered Deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Deposits [Abstract] |  |
Interest-bearing demand deposits | $ 770 | $ 8,751
Money market accounts | 164,505 | 532,047
Certificates of deposit of $250,000 or less | 1,543,269 | 915,623
Certificates of deposit of more than $250,000 | 0 | 0
Total brokered deposits | $ 1,708,544 | $ 1,456,421

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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
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant