Employee Benefit Plans (Details 13) (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)
SERP
Accumulated other comprehensive loss at beginning of fiscal year	1,203	1,165
Net (gain) loss arising during period	(1,687)	93
Prior service cost	(83)
Amortization of unrecognized actuarial loss		(12)
Amortization of prior service cost and transition obligation	(19)	(19)
Tax expense (benefit) of changes during the year, net	706	(24)
Accumulated other comprehensive loss at end of fiscal year	$ 120	$ 1,203