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Employee benefit plans - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 22, 2008
Defined Benefit Plan Disclosure [Line Items]        
Penn Security Bank and Trust Company ESOP shares held and allocated     104,964  
Contribution to ESOP $ 144,000 $ 294,000 $ 218,000  
Contribution by Penn Security Bank and Trust Company Retirement Profit Sharing Plan's 778,000 872,000    
Discretionary contributions 348,000 408,000 $ 234,000  
Percentage of matched contributions by employees     3.00%  
Common stock held in Plan     263,559  
Employee benefit plan expense $ 0 0    
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
Postretirement Life Insurance Plan, description The Postretirement Life Insurance Plan was an unfunded, non-vesting defined benefit plan for employees of Penn Security Bank and Trust Company hired after July 1, 1995; which provided postretirement life insurance benefit of $50,000 at retirement, then decreasing to $5,000 at age 75. Employees hired prior to July 1, 1995 were entitled to three times their salary at retirement. During 2013 the company entered into an agreement with an insurance company to transfer all risk and obligation for benefits payable as to the current retiree group in exchange for a one time fixed payment, additionally the company eliminated retiree life insurance for current employees.      
Postretirement life insurance benefit $ 50,000      
Age limit for postretirement life insurance benefit 75 years      
Increase in accumulated benefit obligation   2,138,000    
Defined benefit plan accumulated benefit obligation $ 17,380,000 17,869,000    
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 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Contribution by Penn Security Bank and Trust Company Retirement Profit Sharing Plan's $ 240,000 241,000    
Employee benefit plan expense 15,000 5,000 $ 7,000  
Employee benefit plan liability 63,000 48,000    
Defined benefit plan, net periodic benefit cost over next fiscal year $ (37,000) (140,000) 1,000  
Industry Sector [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Maximum diversification percentage 20.00%      
Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Maximum diversification percentage 10.00%      
After Retirement [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Postretirement life insurance benefit $ 5,000      
2014 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, net periodic benefit cost over next fiscal year $ 219,000      
Cash Equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, target allocation percentage 10.00%      
Fixed Income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, target allocation percentage 40.00%      
Equity [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, target allocation percentage 50.00%      
Safe Harbor [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Contribution by Penn Security Bank and Trust Company Retirement Profit Sharing Plan's $ 430,000 464,000 $ 310,000  
SERPs [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan accrued liabilities 1,244,000 1,167,000    
Defined benefit plan compensation expenses $ 80,000 $ 164,000