Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Change in plan assets:
Fair value of plan assets at beginning of year	$ 4,892	$ 4,497
Actual return on plan assets	529	192
Employer contribution	500	419
Benefits paid	(265)	(216)
Fair value of plan assets at end of year	5,656	4,892
Change in benefit obligation:
Benefit obligation at beginning of year	7,010	5,855
Service cost	272	295
Interest cost	331	327
Actuarial loss	145	0
Effect of change in assumptions	496	749
Benefits paid	(265)	(216)
Benefit obligation at end of year	(7,989)	(7,010)
Funded status (plan assets less benefit obligation)	(2,333)	(2,118)
Amounts recognized in accumulated other comprehensive loss, net of tax, consists of:
Accumulated net actuarial loss	1,872	1,620
Accumulated prior service benefit	(77)	(97)
Amount recognized, end of year	$ 1,795	$ 1,523