Annual report pursuant to Section 13 and 15(d)

Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details)

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Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]                              
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities $ (1,642) $ (559) $ (4,476) $ (4,275) $ (1,437) $ (3,371) $ (294) $ 0 $ 0 $ 0 $ 0 $ 0 $ (10,952) $ (5,102) $ 0
Other than Temporary Impairment Losses, Investments, Number, Available-for-sale Securities                         33 13  
Available-for-sale Securities, Weighted Average Cumulative Losses 6.80%                       6.80%    
Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed 2.91                       2.91    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Delinquency Rate                         35.80%    
Available-for-sale Securities, Weighted Average FICO Score 649                       649    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance       (5,102)       0       0 (5,102) 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment                         (9,537) (5,102) 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses                         (1,415) 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows                         250 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold                         243 0 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance $ (15,561)       $ (5,102)       $ 0       $ (15,561) $ (5,102) $ 0