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Securities (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Schedule of other-than-temporary impairment
Cumulative credit losses on investment securities, through December 31, 2012	$ 400
Cumulative credit losses on investment securities
Additions for credit losses not previously recognized
Cumulative credit losses on investment securities, through March 31, 2013	$ 400

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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