Employee Stock Ownership Plan (Details) (Employee Stock Ownership Plan and Savings [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011
Employee Stock Ownership Plan and Savings [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of components of the Employee stock ownership and savings plan	2		2
Service time requirement for plan eligibility (in months)			6 months
Loan to the ESOP trust	$ 20,000		$ 20,000
Term of loan from company (in years)			30 years
Fixed interest rate on loan from company (in hundredths)	5.48%		5.48%
ESOP compensation expense	33	48	106	122
Shares in ESOP [Abstract]
Allocated ESOP shares	401,624		401,624		301,357
Unearned ESOP shares	1,281,795		1,281,795		1,332,546
Total ESOP shares	1,683,419		1,683,419		1,633,903
Unearned ESOP shares, at cost	12,818		12,818		13,325
Fair value of unearned ESOP shares	$ 974		$ 974		$ 1,452