Regulatory Matters (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
PCB Bancorp
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	9.09%	8.90%
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 224,570	$ 226,069
Common tier 1 capital (to risk-weighted assets), ratio	0.1583	0.1587
Total capital (to risk-weighted assets), amount	$ 242,335	$ 240,750
Total capital (to risk-weighted assets), ratio	0.1709	0.1690
Tier 1 capital (to risk-weighted assets), amount	$ 224,570	$ 226,069
Tier 1 capital (to risk-weighted assets), ratio	0.1583	0.1587
Tier 1 capital (to average assets), amount	$ 224,570	$ 226,069
Tier 1 capital (to average assets), ratio	0.1149	0.1323
Minimum Capital Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 63,828	$ 64,087
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 113,472	$ 113,933
Total capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to risk-weighted assets), amount	$ 85,104	$ 85,450
Tier 1 capital (to risk-weighted assets), ratio	0.060	0.060
Tier 1 capital (to average assets), amount	$ 78,175	$ 68,355
Tier 1 capital (to average assets), ratio	0.040	0.040
Pacific City Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	8.83%	8.71%
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 220,907	$ 223,241
Common tier 1 capital (to risk-weighted assets), ratio	0.1558	0.1568
Total capital (to risk-weighted assets), amount	$ 238,670	$ 237,922
Total capital (to risk-weighted assets), ratio	0.1683	0.1671
Tier 1 capital (to risk-weighted assets), amount	$ 220,907	$ 223,241
Tier 1 capital (to risk-weighted assets), ratio	0.1558	0.1568
Tier 1 capital (to average assets), amount	$ 220,907	$ 223,241
Tier 1 capital (to average assets), ratio	0.1130	0.1306
Minimum Capital Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 63,825	$ 64,084
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 113,467	$ 113,928
Total capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to risk-weighted assets), amount	$ 85,100	$ 85,446
Tier 1 capital (to risk-weighted assets), ratio	0.060	0.060
Tier 1 capital (to average assets), amount	$ 78,172	$ 68,354
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	$ 92,192	$ 92,566
Common tier 1 capital (to risk-weighted assets), ratio	6.50%	6.50%
Total capital (to risk-weighted assets), amount	$ 141,834	$ 142,410
Total capital (to risk-weighted assets), ratio	0.100	0.100
Tier 1 capital (to risk-weighted assets), amount	$ 113,467	$ 113,928
Tier 1 capital (to risk-weighted assets), ratio	0.080	0.080
Tier 1 capital (to average assets), amount	$ 97,715	$ 85,442
Tier 1 capital (to average assets), ratio	0.050	0.050