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Regulatory matters - Schedule of Bank's Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Consolidated [Member]    
Schedule of Capitalization [Line Items]    
Common equity Tier 1 capital to risk-weighted assets, Actual Amount $ 185,365  
Tier 1 capital to risk-weighted assets, Actual Amount 185,365 $ 178,061
Total capital to risk-weighted assets, Actual Amount 198,340 188,457
Tier 1 capital to average assets, Actual Amount $ 185,365 $ 178,061
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio 13.52%  
Tier 1 capital to risk-weighted assets, Actual Ratio 13.52% 14.75%
Total capital to risk-weighted assets, Actual Ratio 14.47% 15.61%
Tier 1 capital to average assets, Actual Ratio 10.80% 10.76%
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount $ 61,675  
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount 82,233 $ 48,276
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount 109,644 96,552
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount $ 68,638 $ 66,168
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 4.50%  
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 6.00% 4.00%
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 8.00% 8.00%
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Ratio 4.00% 4.00%
Peoples Bank [Member]    
Schedule of Capitalization [Line Items]    
Common equity Tier 1 capital to risk-weighted assets, Actual Amount $ 179,362  
Tier 1 capital to risk-weighted assets, Actual Amount 179,362 $ 171,984
Total capital to risk-weighted assets, Actual Amount 192,337 182,380
Tier 1 capital to average assets, Actual Amount $ 179,362 $ 171,984
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio 13.11%  
Tier 1 capital to risk-weighted assets, Actual Ratio 13.11% 14.28%
Total capital to risk-weighted assets, Actual Ratio 14.05% 15.15%
Tier 1 capital to average assets, Actual Ratio 10.48% 10.42%
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount $ 61,583  
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount 82,111 $ 48,165
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount 109,481 96,330
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount $ 68,474 $ 65,993
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 4.50%  
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 6.00% 4.00%
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio 8.00% 8.00%
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Ratio 4.00% 4.00%
Common equity Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount $ 88,954  
Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount 109,481 $ 72,247
Total capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount 136,852 120,412
Tier 1 capital to average assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount $ 85,592 $ 82,492
Common equity Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio 6.50%  
Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio 8.00% 6.00%
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, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio 5.00% 5.00%