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Regulatory matters - Schedule of Bank's Capital Amounts and Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Consolidated [Member]    
Schedule of Capitalization [Line Items]    
Tier 1 capital to risk-weighted assets, Actual Amount $ 178,061us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
$ 163,609us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total capital to risk-weighted assets, Actual Amount 188,457us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
171,677us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to average assets, Actual Amount 178,061us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
163,609us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to risk-weighted assets, Actual Ratio 14.75%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
13.62%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total capital to risk-weighted assets, Actual Ratio 15.61%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
14.29%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to average assets, Actual Ratio 10.76%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
10.12%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount 48,276us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
48,040us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount 96,552us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
96,080us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount 66,168us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
64,664us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Peoples Bank [Member]    
Schedule of Capitalization [Line Items]    
Tier 1 capital to risk-weighted assets, Actual Amount 171,984us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
157,758us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital to risk-weighted assets, Actual Amount 182,380us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
165,836us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to average assets, Actual Amount 171,984us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
157,758us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to risk-weighted assets, Actual Ratio 14.28%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13.09%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital to risk-weighted assets, Actual Ratio 15.15%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13.76%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to average assets, Actual Ratio 10.42%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9.79%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount 48,165us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
48,192us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount 96,330us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
96,384us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount 65,993us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
64,484us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount 72,247us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
72,228us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount 120,412us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
120,480us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to average assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount $ 82,492us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 80,605us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier 1 capital to average assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember