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Investments Realized gains and losses from sales of AFS Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Gain (Loss) on Securities [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption         $ (5)
Proceeds from Sale of Available-for-sale Securities $ 19,673 $ 70,314 $ 35,550 $ 103,031  
Available-for-sale Securities, Gross Realized Gains 0 255 7 274  
Available-for-sale Securities, Gross Realized Losses 0 $ (18) (1) $ (18)  
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax $ 7   $ (23)    
Accounting Standards Update 2016-01 [Member]          
Gain (Loss) on Securities [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption         339
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]          
Gain (Loss) on Securities [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption         $ 339