Quarterly report pursuant to Section 13 or 15(d)

Schedule of Credit Losses on Debt Securities (Details)

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Schedule of Credit Losses on Debt Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Schedule Of Credit Losses On Debt Securities Details  
Beginning balance of credit losses on debt securities for which a portion of an OTTI was recognized in other comprehensive income $ (4,770)
Additions for credit losses on securities for which an OTTI was not previously recognized   
Increases to credit losses on securities for which an OTTI was previously recognized and a portion of an OTTI was recognized in other comprehensive income (594)
Additions for credit losses on securities for which an OTTI was previously recognized without any portion of OTTI recognized in other comprehensive income   
Reduction for credit losses on securities for which no OTTI was recognized in other comprehensive income at the current measurement date   
Reduction for securities sold during the period   
Reduction for securities deconsolidated during the period   
Reduction for increases in cash flows expected to be collected that are recognized over the remaining life of the security 9
Ending balance of credit losses on debt securities for which a portion of an OTTI was recognized in other comprehensive income $ (5,355)