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Employee Benefits (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
Employee
shares
Mar. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of former union employees not covered under plan | Employee   39  
Employee Stock Ownership Plan and Trust (ESOP) [Member]      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Additional shares contributed to ESOP (in shares) | shares   43,300  
Shares released from trust (in shares) | shares 43,300 43,300  
Total remaining balance of shares in the ESOP (in shares) | shares 200 200  
Postretirement Benefits [Member]      
Net Periodic benefit costs related to retirement plans [Abstract]      
Service cost   $ 0 $ 0
Interest cost   2 3
Amortization of prior service cost   0 (13)
Actuarial net (gain) loss   (59) 275
Net periodic benefit cost (credit)   $ (57) $ 265
Supplemental Executive Retirement Plan [Member]      
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Employer discretionary contribution amount $ 300