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Investments (Accretable Yield on Purchased Credit Impaired Securities) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Balance, beginning of period $ 66,269 $ 0 $ 39,239 $ 0
Investments purchased 4,374 11,463 34,325 11,463
Accretion (1,952) (6) (5,774) (6)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans 0 0 (832) 0
Reclassification to nonaccretable difference 1,388 0 3,121 0
Balance, end of period $ 70,079 $ 11,457 $ 70,079 $ 11,457