Regulatory matters - Schedule of Bank's Capital Amounts and Ratios (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Consolidated
Common equity Tier 1 capital to risk-weighted assets
Common equity Tier 1 capital to risk-weighted assets, Actual Amount	$ 281,802	$ 250,397
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio	12.32	12.16
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 102,949	$ 92,631
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio	4.50	4.50
Tier 1 capital to risk-weighted assets
Tier 1 capital to risk-weighted assets, Actual Amount	$ 281,802	$ 250,397
Tier 1 capital to risk-weighted assets, Actual Ratio	12.32	12.16
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 137,266	$ 123,508
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio	6.00	6.00
Total capital to risk-weighted assets
Total capital to risk-weighted assets, Actual Amount	$ 310,185	$ 310,741
Total capital to risk-weighted assets, Actual Ratio	13.56	15.10
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 183,021	$ 164,677
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio	8.00	8.00
Tier 1 capital to average assets
Tier 1 capital to average assets, Actual Amount	$ 281,802	$ 250,397
Tier 1 capital to average assets, Actual Ratio	9.16	9.28
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount	$ 123,013	$ 107,878
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Ratio	4.00	4.00
Peoples Bank
Common equity Tier 1 capital to risk-weighted assets
Common equity Tier 1 capital to risk-weighted assets, Actual Amount	$ 310,102	$ 282,104
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio	13.76	13.73
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 101,449	$ 92,461
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio	4.50	4.50
Common equity Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount	$ 146,538	$ 133,554
Common equity Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio	6.50	6.50
Tier 1 capital to risk-weighted assets
Tier 1 capital to risk-weighted assets, Actual Amount	$ 310,102	$ 282,104
Tier 1 capital to risk-weighted assets, Actual Ratio	13.76	13.73
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 135,266	$ 123,281
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio	6.00	6.00
Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount	$ 180,355	$ 164,374
Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio	8.00	8.00
Total capital to risk-weighted assets
Total capital to risk-weighted assets, Actual Amount	$ 338,284	$ 307,807
Total capital to risk-weighted assets, Actual Ratio	15.01	14.98
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 180,355	$ 164,374
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio	8.00	8.00
Total capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount	$ 225,443	$ 205,468
Total capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio	10.00	10.00
Tier 1 capital to average assets
Tier 1 capital to average assets, Actual Amount	$ 310,102	$ 282,104
Tier 1 capital to average assets, Actual Ratio	9.58	10.08
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount	$ 129,476	$ 111,891
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Ratio	4.00	4.00
Tier 1 capital to average assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount	$ 161,845	$ 139,864
Tier 1 capital to average assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio	5.00	5.00

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Tier 1 Common Equity Risk Based Capital as defined in the regulations.

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Amount of total capital as defined by regulatory framework.

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