Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Pacific City Financial Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	9.31%	5.20%
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 210,871	$ 142,370
Common tier 1 capital (to risk-weighted assets), ratio	16.28%	12.15%
Total capital (to risk-weighted assets), amount	$ 224,178	$ 154,715
Total capital (to risk-weighted assets), ratio	17.31%	13.20%
Tier 1 capital (to risk-weighted assets), amount	$ 210,871	$ 142,370
Tier 1 capital (to risk-weighted assets), ratio	16.28%	12.15%
Tier 1 capital (to average assets), amount	$ 210,871	$ 142,370
Tier 1 capital (to average assets), ratio	12.60%	10.01%
Minimum Capital Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 58,273	$ 52,730
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 103,596	$ 93,766
Total capital (to risk-weighted assets), ratio	8.00%	8.00%
Tier 1 capital (to risk-weighted assets), amount	$ 77,697	$ 70,306
Tier 1 capital (to risk-weighted assets), ratio	6.00%	6.00%
Tier 1 capital (to average assets), amount	$ 66,930	$ 56,891
Tier 1 capital (to average assets), ratio	4.00%	4.00%
Pacific City Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	9.21%	5.12%
Actual
Common tier 1 capital (to risk-weighted assets), amount	$ 209,587	$ 141,361
Common tier 1 capital (to risk-weighted assets), ratio	16.19%	12.06%
Total capital (to risk-weighted assets), amount	$ 222,894	$ 153,705
Total capital (to risk-weighted assets), ratio	17.21%	13.12%
Tier 1 capital (to risk-weighted assets), amount	$ 209,587	$ 141,361
Tier 1 capital (to risk-weighted assets), ratio	16.19%	12.06%
Tier 1 capital (to average assets), amount	$ 209,587	$ 141,361
Tier 1 capital (to average assets), ratio	12.53%	9.94%
Minimum Capital Requirement
Common tier 1 capital (to risk-weighted assets), amount	$ 58,272	$ 52,747
Common tier 1 capital (to risk-weighted assets), ratio	4.50%	4.50%
Total capital (to risk-weighted assets), amount	$ 103,594	$ 93,723
Total capital (to risk-weighted assets), ratio	8.00%	8.00%
Tier 1 capital (to risk-weighted assets), amount	$ 77,696	$ 70,329
Tier 1 capital (to risk-weighted assets), ratio	6.00%	6.00%
Tier 1 capital (to average assets), amount	$ 66,929	$ 56,886
Tier 1 capital (to average assets), ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Provisions
Common tier 1 capital (to risk-weighted assets), amount	$ 84,171	$ 76,189
Common tier 1 capital (to risk-weighted assets), ratio	6.50%	6.50%
Total capital (to risk-weighted assets), amount	$ 129,493	$ 117,153
Total capital (to risk-weighted assets), ratio	10.00%	10.00%
Tier 1 capital (to risk-weighted assets), amount	$ 103,594	$ 93,772
Tier 1 capital (to risk-weighted assets), ratio	8.00%	8.00%
Tier 1 capital (to average assets), amount	$ 83,661	$ 71,107
Tier 1 capital (to average assets), ratio	5.00%	5.00%

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

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Common Equity Tier 1 Capital Required to be Well Capitalized 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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Compliance with Regulatory Capital Requirements under Banking Regulations, To Be Well Capitalized Under Prompt Corrective Provisions [Abstract]

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The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Amount of Common Equity Tier One Risk-based Capital, as defined by regulatory framework.

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Percentage of Common Equity Tier One Risk-based Capital to total risk-weighted assets, as defined by regulatory framework.

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Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as adequately capitalized under regulatory framework for prompt corrective action.

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Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as well-capitalized under regulatory framework for prompt corrective action.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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