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Investment Securities (Other long-term investments) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Payments to Acquire Other Investments $ 13,300 $ 28,600    
Other Investments 329,200   $ 315,800  
Hedge and private equity funds included in other long-term investments        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Other Investments 127,800   127,800  
Limited liability companies and private equity securities [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Other Investments 84,300   82,100  
Surplus Note        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Other Investments 62,800   51,500  
Private equity funds        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Other Investments 34,100   32,700  
Affordable Housing Development Fund [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Other Investments 13,400 $ 15,800 14,700 $ 16,800
Partnership investments [Member]        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Other Investments 3,500   3,800  
Other        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Other Investments 3,300   3,200  
Hedge Funds Equity R E I T [Member] | Hedge funds        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Other long-term investments 20,500   20,600  
Unfunded Commitments $ 0   $ 0