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Other Investments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
FHLB and FRB Stock          
Investment in FRB and FHLB stock $ 71,800,000   $ 71,800,000   $ 90,000,000
Private Equity and Alternative Investments          
Investments carried at cost 36,270,000   36,270,000   36,091,000
Recognized impairment losses on cost method investments 100,000 2,500,000 500,000 2,900,000  
Private equity and venture capital
         
Private Equity and Alternative Investments          
Investments carried at cost 20,862,000   20,862,000   20,693,000
Private equity and venture capital | Fair Value | Nonrecurring
         
Alternative Investments Measured at Fair Value on a Nonrecurring Basis          
Fair Value 919,000   919,000    
Unfunded Commitments 179,000   179,000    
Real estate
         
Private Equity and Alternative Investments          
Investments carried at cost 8,108,000   8,108,000   9,223,000
Hedge
         
Private Equity and Alternative Investments          
Investments carried at cost 2,733,000   2,733,000   2,866,000
Other
         
Private Equity and Alternative Investments          
Investments carried at cost $ 4,567,000   $ 4,567,000   $ 3,309,000