Securities (Details 3) (Total debt securities, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Total debt securities
Credit Losses On Debt Securities [Rollforward]
Credit losses at beginning of the period	$ 0	$ 245	$ 441	$ 245
Credit losses related to securities for which an other-than-temporary impairment was previously recognized	0	65	0	65
Sales of securities for which an other-than-temporary impairment was previously recognized	0	0	(441)	0
Ending balance of credit losses on debt securities held for which a portion of an other-than-temporary impairment was recognized in other comprehensive income	$ 0	$ 310	$ 0	$ 310