Cash Value of Life Insurance (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Employee Policies Companies	Jun. 30, 2011 Policies Employee Companies
Summary of the activity in the balance of cash value of life insurance
Beginning balance		$ 50,403	$ 50,541
Increase in cash value of life insurance		900	900
Gain on life insurance death benefit	600	600
Death benefit		(1,611)
Ending balance	50,292	50,292	51,441
End of period death benefit		$ 94,328	$ 94,949
Number of policies owned		136,000	140,000
Insurance companies used		6	6,000
Current and former employees and directors covered		37,000	39,000