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Investments (Details 19) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Allowance For Loan And Lease Losses Roll Forward        
Balance, Beginning of Period $ 11,011,000 $ 7,692,000 $ 11,793,000 $ 6,239,000
Charge-offs (526,000) 0 (4,595,000) (1,157,000)
Recoveries 0 0 0 0
Provision (release) 2,848,000 2,370,000 6,135,000 4,980,000
Balance, End of Period $ 13,333,000 $ 10,062,000 $ 13,333,000 $ 10,062,000