Employee Benefits (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Employee Stock Ownership Plan and Trust (ESOP) [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Additional shares contributed to ESOP (in shares)				58,000
Shares released from trust (in shares)		58,200		58,200
Total remaining balance of shares in the ESOP (in shares)		200		200
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 0	$ 41	$ 0	$ 123
Interest cost		87	65	196	195
Amortization of prior service cost		0	0	0	0
Actuarial net loss		294	57	662	172
Net periodic benefit cost (credit)		381	163	858	490
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	1	0	1
Interest cost		12	7	20	22
Amortization of prior service cost		(27)	(755)	(85)	(2,264)
Actuarial net loss		382	513	1,144	1,535
Net periodic benefit cost (credit)		$ 367	$ (234)	1,079	$ (706)
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Contributions by employer on behalf of employees				700
Estimated future employer contributions in current fiscal year				900
Supplemental Executive Retirement Plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Estimated future employer contributions in current fiscal year				0
Employer discretionary contribution amount				$ 500
Supplemental Executive Retirement Plan [Member] | Subsequent Event [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Contributions by employer on behalf of employees	$ 7,600
Settlement loss	$ 1,500