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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Principle - Consolidated Statements of Financial Condition (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 265,402 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 231,199 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 333,639 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 110,118 us-gaap_CashAndCashEquivalentsAtCarryingValue
Time deposits in financial institutions | 1,900 us-gaap_TimeDepositsAtCarryingValue | 1,900 us-gaap_TimeDepositsAtCarryingValue |  |
Securities available for sale | 393,586 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 345,695 us-gaap_AvailableForSaleSecuritiesDebtSecurities |  |
Loans held for sale |  | 1,187,090 banc_DisposalGroupIncludingDiscontinuedOperationLoansReceivableCarriedatLowerorCostorFairValue |  |
Loans and leases receivable | 3,904,370 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 3,919,642 us-gaap_LoansAndLeasesReceivableNetReportedAmount |  |
Deferred income tax | 14,157 us-gaap_DeferredTaxAssetsLiabilitiesNet | 16,373 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |
Other assets |  | 269,398 us-gaap_OtherAssetsMiscellaneous |  |
Total Assets | 6,097,355 us-gaap_Assets | 5,971,297 us-gaap_Assets | 4,030,465 us-gaap_Assets |
Liabilities and Equity [Abstract] |  |  |  |
Liabilities | 5,583,195 us-gaap_Liabilities | 5,467,982 us-gaap_Liabilities |  |
Total stockholders’ equity | 514,160 us-gaap_StockholdersEquity | 503,315 us-gaap_StockholdersEquity | 325,157 us-gaap_StockholdersEquity | 324,708 us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity | 6,097,355 us-gaap_LiabilitiesAndStockholdersEquity | 5,971,297 us-gaap_LiabilitiesAndStockholdersEquity |  |
As Previously Reported |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 231,199 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 333,639 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 110,118 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Time deposits in financial institutions |  | 1,900 us-gaap_TimeDepositsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Securities available for sale |  | 345,695 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Loans held for sale |  | 1,187,090 banc_DisposalGroupIncludingDiscontinuedOperationLoansReceivableCarriedatLowerorCostorFairValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Loans and leases receivable |  | 3,919,642 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Deferred income tax |  | 16,445 us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Other assets |  | 269,600 us-gaap_OtherAssetsMiscellaneous / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Total Assets |  | 5,971,571 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Liabilities and Equity [Abstract] |  |  |  |
Liabilities |  | 5,467,982 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Total stockholders’ equity |  | 503,589 us-gaap_StockholdersEquity / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Total liabilities and stockholders’ equity |  | 5,971,571 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Effect of Change in Accounting Principle |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Time deposits in financial institutions |  | 0 us-gaap_TimeDepositsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Securities available for sale |  | 0 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Loans held for sale |  | 0 banc_DisposalGroupIncludingDiscontinuedOperationLoansReceivableCarriedatLowerorCostorFairValue / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Loans and leases receivable |  | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Deferred income tax |  | (72)us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Other assets |  | (202)us-gaap_OtherAssetsMiscellaneous / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Total Assets |  | (274)us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Liabilities and Equity [Abstract] |  |  |  |
Liabilities |  | 0 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Total stockholders’ equity |  | (274)us-gaap_StockholdersEquity / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Total liabilities and stockholders’ equity |  | $ (274)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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