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Regulatory Capital Matters (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Common equity tier 1 capital ratio    
Amount $ 391,714banc_TierOneRiskBasedCommonCapital  
Ratio 9.01%banc_TierOneRiskBasedCommonCapitaltoRiskWeightedAssets  
Minimum Capital Requirement 195,659banc_TierOneRiskBasedCommonCapitalRequiredforCapitalAdequacy  
Ratio 4.50%banc_TierOneRiskBasedCommonCapitalRequiredforCapitalAdequacytoRiskWeightedAssets  
Parent Company [Member]    
Total risk-based capital ratio    
Amount 502,054us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
473,656us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Ratio 11.55%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11.28%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Minimum Capital Requirement 347,838us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
335,829us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 risk-based capital ratio    
Amount 470,808us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
442,307us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Ratio 10.83%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10.54%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Minimum Capital Requirement 260,879us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
167,914us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 leverage ratio    
Amount 470,808us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
442,307us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Ratio 7.99%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8.57%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Minimum Capital Requirement 235,611us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
206,502us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Banc Of California National Association [Member]    
Total risk-based capital ratio    
Amount 589,547us-gaap_Capital
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
503,727us-gaap_Capital
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 13.58%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
12.04%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Minimum Capital Requirement 347,348us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
334,834us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Minimum Required to Be Well Capitalized Under Prompt Corrective Action Provisions 434,185us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
418,543us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Tier 1 risk-based capital ratio    
Amount 558,301us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
472,378us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 12.86%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
11.29%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Minimum Capital Requirement 260,511us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
167,417us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Minimum Required to Be Well Capitalized Under Prompt Corrective Action Provisions 347,348us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
251,126us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Common equity tier 1 capital ratio    
Amount 558,301banc_TierOneRiskBasedCommonCapital
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
 
Ratio 12.86%banc_TierOneRiskBasedCommonCapitaltoRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
 
Minimum Capital Requirement 195,383banc_TierOneRiskBasedCommonCapitalRequiredforCapitalAdequacy
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
 
Ratio 4.50%banc_TierOneRiskBasedCommonCapitalRequiredforCapitalAdequacytoRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
 
Minimum Required to Be Well Capitalized Under Prompt Corrective Action Provisions 282,220banc_TierOneRiskBasedCommonCapitalRequiredtobeWellCapitalized
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
 
Ratio 6.50%banc_TierOneRiskBasedCommonCapitalRequiredtobeWellCapitalizedtoRiskWeightedAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
 
Tier 1 leverage ratio    
Amount 558,301us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
472,378us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 9.49%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
9.17%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Minimum Capital Requirement 235,344us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
206,095us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Minimum Required to Be Well Capitalized Under Prompt Corrective Action Provisions $ 294,180us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
$ 257,619us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= banc_BancOfCaliforniaNationalAssociationMember