Regulatory Matters - Schedule of Regulatory Capital Amounts and Ratios (Details) $ in Thousands	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
PCB Bancorp
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 336,642	$ 325,048
Common tier 1 capital (to risk-weighted assets), ratio	0.1141	0.1146
Total capital (to risk-weighted assets), amount	$ 442,042	$ 429,113
Total capital (to risk-weighted assets), ratio	0.1498	0.1513
Tier 1 capital (to risk-weighted assets), amount	$ 405,783	$ 394,189
Tier 1 capital (to risk-weighted assets), ratio	0.1375	0.1389
Tier 1 capital (to average assets), amount	$ 405,783	$ 394,189
Tier 1 capital (to average assets), ratio	0.1189	0.1189
Minimum Capital Adequacy Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 132,770	$ 127,663
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 236,035	$ 226,956
Total capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to risk-weighted assets), amount	$ 177,026	$ 170,217
Tier 1 capital (to risk-weighted assets), ratio	0.060	0.060
Tier 1 capital (to average assets), amount	$ 136,460	$ 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	$ 393,709	$ 382,620
Common tier 1 capital (to risk-weighted assets), ratio	0.1335	0.1349
Total capital (to risk-weighted assets), amount	$ 429,968	$ 417,545
Total capital (to risk-weighted assets), ratio	0.1458	0.1472
Tier 1 capital (to risk-weighted assets), amount	$ 393,709	$ 382,620
Tier 1 capital (to risk-weighted assets), ratio	0.1335	0.1349
Tier 1 capital (to average assets), amount	$ 393,709	$ 382,620
Tier 1 capital (to average assets), ratio	0.1154	0.1155
Minimum Capital Adequacy Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 132,722	$ 127,616
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 235,950	$ 226,873
Total capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to risk-weighted assets), amount	$ 176,963	$ 170,154
Tier 1 capital (to risk-weighted assets), ratio	0.060	0.060
Tier 1 capital (to average assets), amount	$ 136,418	$ 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	$ 191,710	$ 184,334
Common tier 1 capital (to risk-weighted assets), ratio	6.50%	6.50%
Total capital (to risk-weighted assets), amount	$ 294,938	$ 283,591
Total capital (to risk-weighted assets), ratio	0.100	0.100
Tier 1 capital (to risk-weighted assets), amount	$ 235,950	$ 226,873
Tier 1 capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to average assets), amount	$ 170,522	$ 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

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

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

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Amount of total capital as defined by regulatory framework.

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-SubTopic 505
-Name Accounting Standards Codification
-Section 50
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