Employee Benefits (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Employee shares	Jun. 30, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of former union employees not covered under plan | Employee				24
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	$ 0	$ 0
Interest cost		2	3	4	6
Amortization of prior service cost		0	(14)	0	(27)
Actuarial net loss		(271)	115	(330)	390
Net periodic benefit cost (credit)		$ (269)	$ 104	$ (326)	$ 369
Supplemental Executive Retirement Plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer discretionary contribution amount	$ 300