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Securities (Rollfoward of OTTI Recognized in Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Credit related impairment losses on debt securities, beginning balance	$ 3,325	$ 3,104
Credit-related impairment losses on debt securities for which other-than-temporary impairment was not previously recognized	0	0
Additional increases to the amount of credit-related impairment loss on debt securities for which other-than-temporary impairment was previously recognized	2,772	209
Credit related impairment losses on debt securities, ending balance	$ 6,097	$ 3,313

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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