Fair Value Measurements (Details 1) (USD $) In Thousands	3 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010
Changes in fair value of level 3 assets
Balance at beginning of period	$ 2,486	$ 2,401	$ 2,295	$ 4,443	$ 4,515	$ 4,694
Settlement	0	0	0	0	0	(8,342)
Sales	(43)	(55)	(144)	(77)	(395)	(100)
Gains and (losses)-unrealized	148	140	252	286	323	(79)
Gains and (losses)-realized	0	0	(2)	0	0	8,342
Transfers out of Level 3				(2,543)
Balance at end of period	2,591	2,486	2,401	2,109	4,443	4,515
Fixed Income Securities [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	1,244	1,281	1,438	3,973	4,224	4,262
Settlement	0	0	0	0	0	0
Sales	(43)	(55)	(144)	(77)	(395)	(100)
Gains and (losses)-unrealized	17	18	(11)	70	144	62
Gains and (losses)-realized	0	0	(2)		0	0
Transfers out of Level 3				(2,543)
Balance at end of period	1,218	1,244	1,281	1,423	3,973	4,224
Other Assets [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	1,242	1,120	857	470	291	432
Settlement	0	0	0	0	0	(8,342)
Sales	0	0	0	0	0	0
Gains and (losses)-unrealized	131	122	263	216	179	(141)
Gains and (losses)-realized	0	0	0	0	0	8,342
Transfers out of Level 3				0
Balance at end of period	$ 1,373	$ 1,242	$ 1,120	$ 686	$ 470	$ 291