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Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Gain (Loss) on Investments [Line Items]        
Gross Realized Gains $ 1,730 $ 99 $ 8,290 $ 1,546
Gross Realized Losses 0 0 0 (323)
Other-than- temporary Impairment Losses 0 (18) 0 (30)
Net Gains (Losses) 1,730 81 8,290 1,193
Equity Securities [Member]        
Gain (Loss) on Investments [Line Items]        
Gross Realized Gains 1,730 99 5,990 100
Gross Realized Losses 0 0 0 0
Other-than- temporary Impairment Losses 0 0 0 (12)
Net Gains (Losses) 1,730 99 5,990 88
Debt Securities [Member]        
Gain (Loss) on Investments [Line Items]        
Gross Realized Gains 0 0 2,300 1,446
Gross Realized Losses 0 0 0 (323)
Other-than- temporary Impairment Losses 0 (18) 0 (18)
Net Gains (Losses) $ 0 $ (18) $ 2,300 $ 1,105