Regulatory Matters - Schedule of Regulatory Capital Amounts and Ratios (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
PCB Bancorp
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 290,431	$ 288,174
Common tier 1 capital (to risk-weighted assets), ratio	0.1188	0.1223
Total capital (to risk-weighted assets), amount	$ 389,349	$ 386,125
Total capital (to risk-weighted assets), ratio	0.1593	0.1639
Tier 1 capital (to risk-weighted assets), amount	$ 359,572	$ 357,315
Tier 1 capital (to risk-weighted assets), ratio	0.1471	0.1516
Tier 1 capital (to average assets), amount	$ 359,572	$ 357,315
Tier 1 capital (to average assets), ratio	0.1273	0.1343
Minimum Capital Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 109,998	$ 106,043
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 195,552	$ 188,521
Total capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to risk-weighted assets), amount	$ 146,664	$ 141,391
Tier 1 capital (to risk-weighted assets), ratio	0.060	0.060
Tier 1 capital (to average assets), amount	$ 112,954	$ 106,423
Tier 1 capital (to average assets), ratio	0.040	0.040
PCB Bank
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 351,242	$ 350,038
Common tier 1 capital (to risk-weighted assets), ratio	0.1437	0.1485
Total capital (to risk-weighted assets), amount	$ 381,020	$ 378,849
Total capital (to risk-weighted assets), ratio	0.1559	0.1607
Tier 1 capital (to risk-weighted assets), amount	$ 351,242	$ 350,038
Tier 1 capital (to risk-weighted assets), ratio	0.1437	0.1485
Tier 1 capital (to average assets), amount	$ 351,242	$ 350,038
Tier 1 capital (to average assets), ratio	0.1244	0.1316
Minimum Capital Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 109,997	$ 106,081
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 195,550	$ 188,588
Total capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to risk-weighted assets), amount	$ 146,663	$ 141,441
Tier 1 capital (to risk-weighted assets), ratio	0.060	0.060
Tier 1 capital (to average assets), amount	$ 112,953	$ 106,421
Tier 1 capital (to average assets), ratio	0.040	0.040
To Be Well Capitalized Under Prompt Corrective Provisions
Common tier 1 capital (to risk-weighted assets), amount	$ 158,885	$ 153,228
Common tier 1 capital (to risk-weighted assets), ratio	6.50%	6.50%
Total capital (to risk-weighted assets), amount	$ 244,438	$ 235,735
Total capital (to risk-weighted assets), ratio	0.100	0.100
Tier 1 capital (to risk-weighted assets), amount	$ 195,550	$ 188,588
Tier 1 capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to average assets), amount	$ 141,191	$ 133,026
Tier 1 capital (to average assets), ratio	0.050	0.050

Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets

No definition available.

Name:	pcb_CommonEquityTier1CapitalRequiredforCapitalAdequacytoRiskWeightedAssets
Namespace Prefix:	pcb_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Common Equity Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets

+ References

No definition available.

+ Details

Name:	pcb_CommonEquityTier1CapitalRequiredtobeWellCapitalizedtoRiskWeightedAssets
Namespace Prefix:	pcb_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Compliance with Regulatory Capital Requirements under Banking Regulations, Actual [Abstract]

+ References

No definition available.

+ Details

Name:	pcb_CompliancewithRegulatoryCapitalRequirementsunderBankingRegulationsActualAbstract
Namespace Prefix:	pcb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Compliance with Regulatory Capital Requirements under Banking Regulations, Minimum Capital Requirements [Abstract]

+ References

No definition available.

+ Details

Name:	pcb_CompliancewithRegulatoryCapitalRequirementsunderBankingRegulationsMinimumCapitalRequirementsAbstract
Namespace Prefix:	pcb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Compliance with Regulatory Capital Requirements under Banking Regulations, To Be Well Capitalized Under Prompt Corrective Provisions [Abstract]

+ References

No definition available.

+ Details

Name:	pcb_CompliancewithRegulatoryCapitalRequirementsunderBankingRegulationsToBeWellCapitalizedUnderPromptCorrectiveProvisionsAbstract
Namespace Prefix:	pcb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of total capital as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_Capital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

+ Details

Name:	us-gaap_CapitalRequiredForCapitalAdequacy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_CapitalRequiredToBeWellCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_CapitalToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_CommonEquityTierOneCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_CommonEquityTierOneCapitalRatio
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum Common Equity Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum Common Equity Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of Tier 1 leverage capital as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio of Tier 1 capital to average assets as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneLeverageCapitalToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of Tier 1 risk-based capital as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of minimum Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of minimum Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: