Employee Benefit Plans (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net (gain) loss arising during period	$ 13,975	$ (7,798)	$ (2,307)
Pension Plan
Accumulated other comprehensive loss at beginning of fiscal year	9,855	5,432
Net (gain) loss arising during period	(12,288)	7,707
Prior service cost	(32)
Transition Obligation	(30)
Amortization of unrecognized actuarial loss	(545)	(382)
Amortization of prior service cost and transition obligation	(14)	(13)
Tax expense (benefit) of changes during the year, net	5,117	(2,889)
Accumulated other comprehensive loss at end of fiscal year	$ 2,063	$ 9,855