Regulatory Matters - Schedule of Regulatory Capital Amounts and Ratios (Details) $ in Thousands	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
PCB Bancorp
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 332,524	$ 325,048
Common tier 1 capital (to risk-weighted assets), ratio	0.1148	0.1146
Total capital (to risk-weighted assets), amount	$ 437,001	$ 429,113
Total capital (to risk-weighted assets), ratio	0.1509	0.1513
Tier 1 capital (to risk-weighted assets), amount	$ 401,665	$ 394,189
Tier 1 capital (to risk-weighted assets), ratio	0.1387	0.1389
Tier 1 capital (to average assets), amount	$ 401,665	$ 394,189
Tier 1 capital (to average assets), ratio	0.1205	0.1189
Minimum Capital Adequacy Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 130,359	$ 127,663
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 231,750	$ 226,956
Total capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to risk-weighted assets), amount	$ 173,812	$ 170,217
Tier 1 capital (to risk-weighted assets), ratio	0.060	0.060
Tier 1 capital (to average assets), amount	$ 133,293	$ 132,582
Tier 1 capital (to average assets), ratio	0.040	0.040
PCB Bank
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 389,882	$ 382,620
Common tier 1 capital (to risk-weighted assets), ratio	0.1346	0.1349
Total capital (to risk-weighted assets), amount	$ 425,218	$ 417,545
Total capital (to risk-weighted assets), ratio	0.1468	0.1472
Tier 1 capital (to risk-weighted assets), amount	$ 389,882	$ 382,620
Tier 1 capital (to risk-weighted assets), ratio	0.1346	0.1349
Tier 1 capital (to average assets), amount	$ 389,882	$ 382,620
Tier 1 capital (to average assets), ratio	0.1170	0.1155
Minimum Capital Adequacy Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 130,311	$ 127,616
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 231,664	$ 226,873
Total capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to risk-weighted assets), amount	$ 173,748	$ 170,154
Tier 1 capital (to risk-weighted assets), ratio	0.060	0.060
Tier 1 capital (to average assets), amount	$ 133,250	$ 132,540
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	$ 188,227	$ 184,334
Common tier 1 capital (to risk-weighted assets), ratio	6.50%	6.50%
Total capital (to risk-weighted assets), amount	$ 289,580	$ 283,591
Total capital (to risk-weighted assets), ratio	0.100	0.100
Tier 1 capital (to risk-weighted assets), amount	$ 231,664	$ 226,873
Tier 1 capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to average assets), amount	$ 166,563	$ 165,675
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-types: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-types: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/1943274/2147477270/942-505-50-1

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/1943274/2147477270/942-505-50-1B

+ 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: