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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
Mar. 31, 2017
Mar. 31, 2016
Gain (Loss) on Investments [Line Items]    
Gross Realized Gains $ 1,106 $ 947
Gross Realized Losses 0 0
Net Gains (Losses) 1,106 947
Equity Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Gross Realized Gains 1,045 733
Gross Realized Losses 0 0
Net Gains (Losses) 1,045 733
Debt Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Gross Realized Gains 61 214
Gross Realized Losses 0 0
Net Gains (Losses) $ 61 $ 214