Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011
Changes in fair value of level 3 assets
Balance at beginning of period	$ 1,888	$ 2,686	$ 2,401	$ 2,295
Sales			(55)	(144)
Gains and (losses)-unrealized	119	217	140	252
Gains and (losses)-realized	(1)			(2)
Transfers out of Level 3		(1,015)
Balance at end of period	2,006	1,888	2,486	2,401
Fixed Income Securities [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	157	1,170	1,281	1,438
Sales			(55)	(144)
Gains and (losses)-unrealized	3	2	18	(11)
Gains and (losses)-realized	(1)			(2)
Transfers out of Level 3		(1,015)
Balance at end of period	159	157	1,244	1,281
Other Assets [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	1,731	1,516	1,120	857
Gains and (losses)-unrealized	116	215	122	263
Balance at end of period	$ 1,847	$ 1,731	$ 1,242	$ 1,120