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SECURITIES AVAILABLE FOR SALE - Additional Information (Detail) (USD $) | Mar. 31, 2015 security | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, pledged | $ 32,200,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | $ 27,100,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Securities available for sale portfolio | 96 banc_NumberOfAvailableForSaleSecuritiesInPortfolio |
Securities in unrealized loss position | 33 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 |
Amount of rated securities portfolio | 393,586,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 345,695,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities
AAA, AA or A |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amount of rated securities portfolio | 392,500,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / invest_CreditRatingSourceAxis = banc_VariousCreditRatingOrganizationsRatingAorBetterMember |
BBB |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amount of rated securities portfolio | $ 1,000,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / invest_CreditRatingSourceAxis = banc_VariousCreditRatingOrganizationsRatingBBBMember |

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 + Details
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