XML 23 R70.htm IDEA: XBRL DOCUMENT v2.4.1.9
LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2015
Loan
Dec. 31, 2014
Loan
Mar. 31, 2015
Loan
Dec. 31, 2014
Loan
Mar. 31, 2014
Financing Receivable, Recorded Investment [Line Items]          
Amount $ 3,933,715us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 3,949,122us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 3,933,715us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 3,949,122us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 2,396,995us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Non-Traditional Mortgages (NTM)          
Financing Receivable, Recorded Investment [Line Items]          
Count 402us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
407us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
     
Amount 353,825us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
350,575us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
353,825us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
350,575us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
 
Amount change 3,300banc_LoansandLeasesReceivableGrossIncreaseDecreaseinPeriod
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
       
Percent Change 0.90%banc_LoansandLeasesReceivableGrossPercentageIncreaseDecreaseinPeriod
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
       
Non-Traditional Mortgages (NTM) | First lien          
Financing Receivable, Recorded Investment [Line Items]          
Count 382us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
387us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
     
Amount 348,964us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
345,483us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
348,964us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
345,483us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
 
Non-Traditional Mortgages (NTM) | Green Loans          
Financing Receivable, Recorded Investment [Line Items]          
Amount 124,700us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
128,200us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
124,700us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
128,200us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Non-Traditional Mortgages (NTM) | Green Loans | First lien          
Financing Receivable, Recorded Investment [Line Items]          
Count 147us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
148us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
147us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
148us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Amount 119,958us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
123,177us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
119,958us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
123,177us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Count Change     (1)banc_LoansandLeasesReceivableIncreaseDecreaseinNumberofLoans
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Amount change     (3,219)banc_LoansandLeasesReceivableGrossIncreaseDecreaseinPeriod
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Percent Change     0.00%banc_LoansandLeasesReceivableGrossPercentageIncreaseDecreaseinPeriod
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio          
Financing Receivable, Recorded Investment [Line Items]          
Concentration risk percentage     100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Greater than 800          
Financing Receivable, Recorded Investment [Line Items]          
Count     28us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
28us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Amount 19,448us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
20,248us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
19,448us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
20,248us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Count Change     0banc_LoansandLeasesReceivableIncreaseDecreaseinNumberofLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Amount change     (800)banc_LoansandLeasesReceivableGrossIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Percent Change     (0.20%)banc_LoansandLeasesReceivableGrossPercentageIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Greater than 800 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio          
Financing Receivable, Recorded Investment [Line Items]          
Concentration risk percentage     16.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
16.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_FICOScoreGreaterthanEightHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 700-799          
Financing Receivable, Recorded Investment [Line Items]          
Count     72us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
72us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Amount 50,769us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
52,532us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
50,769us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
52,532us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Count Change     0banc_LoansandLeasesReceivableIncreaseDecreaseinNumberofLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Amount change     (1,763)banc_LoansandLeasesReceivableGrossIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Percent Change     (0.40%)banc_LoansandLeasesReceivableGrossPercentageIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 700-799 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio          
Financing Receivable, Recorded Investment [Line Items]          
Concentration risk percentage     42.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
42.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSevenHundredtoSevenHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 600-699          
Financing Receivable, Recorded Investment [Line Items]          
Count     28us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
29us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Amount 30,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
31,053us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
30,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
31,053us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Count Change     (1)banc_LoansandLeasesReceivableIncreaseDecreaseinNumberofLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Amount change     (622)banc_LoansandLeasesReceivableGrossIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Percent Change     0.20%banc_LoansandLeasesReceivableGrossPercentageIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 600-699 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio          
Financing Receivable, Recorded Investment [Line Items]          
Concentration risk percentage     25.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
25.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_FICOScoreSixHundredtoSixHundredNinetyNineMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Less than 600          
Financing Receivable, Recorded Investment [Line Items]          
Count     8us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
8us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Amount 11,873us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
11,893us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
11,873us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
11,893us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Count Change     0banc_LoansandLeasesReceivableIncreaseDecreaseinNumberofLoans
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Amount change     (20)banc_LoansandLeasesReceivableGrossIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Percent Change     0.20%banc_LoansandLeasesReceivableGrossPercentageIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Less than 600 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio          
Financing Receivable, Recorded Investment [Line Items]          
Concentration risk percentage     9.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
9.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_FICOScoreLessthanSixHundredMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Non-Traditional Mortgages (NTM) | Green Loans | First lien | No FICO          
Financing Receivable, Recorded Investment [Line Items]          
Count     11us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
11us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Amount 7,437us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
7,451us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
7,437us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
7,451us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
 
Count Change     0banc_LoansandLeasesReceivableIncreaseDecreaseinNumberofLoans
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Amount change     $ (14)banc_LoansandLeasesReceivableGrossIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Percent Change     0.20%banc_LoansandLeasesReceivableGrossPercentageIncreaseDecreaseinPeriod
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
   
Non-Traditional Mortgages (NTM) | Green Loans | First lien | No FICO | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio          
Financing Receivable, Recorded Investment [Line Items]          
Concentration risk percentage     6.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember
6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= banc_NonTraditionalSingleFamilyResidentialMortgageGreenLoansFirstLienPortfolioMember
/ us-gaap_ConcentrationRiskByTypeAxis
= banc_LoanPortfolioConcentrationRiskMember
/ banc_CreditScoreFICOAxis
= banc_NoFICOScoreAvailableMember
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_ProductOrServiceAxis
= banc_GreenLoansMember