Securities (Details 6) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cumulative credit related losses recognized in earnings
Balance at January 1	$ (3,337)	$ (3,075)
Additions related to credit losses for which OTTI was not previously recognized		(262)
Increases in credit loss for which OTTI was previously recognized
Balance at September 30	$ (3,337)	$ (3,337)