Regulatory Capital - Schedule of actual amount and capital ratios of company and bank (Details) - Bank $ in Thousands	Mar. 31, 2021 USD ($)
Total Capital to Risk Weighted Assets
Total capital to risk weighted assets, actual capital amount	$ 187,050
Total capital to risk weighted assets, actual capital ratio	0.168
Total capital to risk weighted assets, for capital adequacy purposes, amount	$ 133,331
Total capital to risk weighted assets to be categorized as well-capitalized, amount	111,678
Tier 1 capital to risk weighted assets
Tier 1 capital to risk weighted assets, actual capital amount	$ 173,047
Tier 1 capital to risk weighted asset, actual capital ratio	0.155
Tier 1 risk based capital required for capital adequacy	$ 73,987
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, amount	89,343
Tier 1 Capital to Average Assets
Tier 1 capital to average assets, actual capital amount	$ 173,047
Tier 1 capital to average asset, actual capital ratio	0.112
Tier 1 capital to average assets, for capital adequacy purposes, amount	$ 61,835
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, amount	$ 77,294
Minimum
Total Capital to Risk Weighted Assets
Total capital to risk weighted assets, for capital adequacy purposes, ratio	0.08625
Total capital to risk weighted assets to be categorized as well-capitalized, ratio	0.100
Tier 1 capital to risk weighted assets
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio	0.06625
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, ratio	0.080
Tier 1 Capital to Average Assets
Tier 1 capital to average assets, for capital adequacy purposes, ratio	0.040
Tier 1 leverage capital required to be well capitalized to average assets	0.050
Common stock
Tier 1 capital to risk weighted assets
Tier 1 capital to risk weighted assets, actual capital amount	$ 173,047
Tier 1 capital to risk weighted asset, actual capital ratio	0.155
Tier 1 risk based capital required for capital adequacy	$ 57,235
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, amount	$ 72,591
Common stock \| Minimum
Tier 1 capital to risk weighted assets
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio	0.05125
Tier 1 capital to risk weighted assets, to be categorized as well capitalized, ratio	0.065

PACIFIC MERCANTILE BANCORP 10-Q