Regulatory matters - Schedule of Bank's Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Consolidated
Common equity Tier 1 capital to risk-weighted assets
Common equity Tier 1 capital to risk-weighted assets, Actual Amount	$ 194,877	$ 185,365
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio	12.49%	13.52%
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 70,205	$ 61,675
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	$ 194,877	$ 185,365
Tier 1 capital to risk-weighted assets, Actual Ratio	12.49%	13.52%
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 93,607	$ 82,233
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	$ 210,838	$ 198,340
Total capital to risk-weighted assets, Actual Ratio	13.51%	14.47%
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 124,810	$ 109,644
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	$ 194,877	$ 185,365
Tier 1 capital to average assets, Actual Ratio	10.16%	10.80%
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount	$ 76,760	$ 68,638
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	$ 189,128	$ 179,362
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio	12.14%	13.11%
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 70,120	$ 61,583
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	$ 101,284	$ 88,954
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	$ 189,128	$ 179,362
Tier 1 capital to risk-weighted assets, Actual Ratio	12.14%	13.11%
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 93,493	$ 82,111
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	$ 124,657	$ 109,481
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	$ 205,089	$ 192,337
Total capital to risk-weighted assets, Actual Ratio	13.16%	14.05%
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount	$ 124,657	$ 109,481
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	$ 155,822	$ 136,852
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	$ 189,128	$ 179,362
Tier 1 capital to average assets, Actual Ratio	9.88%	10.48%
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount	$ 76,602	$ 68,474
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	$ 95,753	$ 85,592
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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The Tier One minimum Common Equity Capital Ratio ( Tier one Common Equity 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 Tier 1 Common Equity Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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

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The amount of total capital as defined in the regulations.

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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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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 minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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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 Tier One Capital Ratio (Tier one 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 Tier 1 Risk Based Capital 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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