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Employee benefit plans - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 22, 2008
Defined Benefit Plan Disclosure        
Contribution to ESOP $ 156,000 $ 144,000 $ 294,000  
Contribution by Penn Security Bank and Trust Company Retirement Profit Sharing Plan's 786,000 778,000 872,000  
Discretionary contributions $ 340,000 348,000 408,000  
Maximum annual benefit percent in excess of federal limits 6.00%      
Retirement age period for fixed benefits payable 65 years      
Benefits accrued under employees' pension plan       $ 0
Decrease in accumulated benefit obligation $ 256,000 352,000    
Defined benefit plan accumulated benefit obligation $ 16,703,000 17,380,000    
Defined benefit plan, diversification We invest in individual high-grade common stocks that are selected from our approved list; (ii) diversification is maintained by having no more than 20% in any industry sector and no individual equity representing more than 10% of the portfolio      
Amount of company's common stock included in equity securities $ 0 0    
Expected payment period of benefits payment 5 years      
Pension Benefits        
Defined Benefit Plan Disclosure        
Contribution by Penn Security Bank and Trust Company Retirement Profit Sharing Plan's $ 54,000 240,000    
Employee benefit plan expense 13,000 15,000 5,000  
Employee benefit plan liability 76,000 63,000    
Defined benefit plan, net periodic benefit cost over next fiscal year $ (19,000) (37,000) (140,000)  
Industry Sector        
Defined Benefit Plan Disclosure        
Maximum diversification percentage 20.00%      
Equity Securities        
Defined Benefit Plan Disclosure        
Maximum diversification percentage 10.00%      
2014        
Defined Benefit Plan Disclosure        
Defined benefit plan, net periodic benefit cost over next fiscal year $ 195,000      
Cash Equivalents        
Defined Benefit Plan Disclosure        
Defined benefit plan, target allocation percentage 10.00%      
Fixed Income        
Defined Benefit Plan Disclosure        
Defined benefit plan, target allocation percentage 40.00%      
Equity        
Defined Benefit Plan Disclosure        
Defined benefit plan, target allocation percentage 50.00%      
Safe Harbor        
Defined Benefit Plan Disclosure        
Contribution by Penn Security Bank and Trust Company Retirement Profit Sharing Plan's $ 446,000 430,000 464,000  
SERPs        
Defined Benefit Plan Disclosure        
Defined benefit plan accrued liabilities 1,416,000 1,244,000    
Salaries and employee benefits expense $ 254,000 $ 157,000 $ 176,000