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Investment Securities - Summary of Sale of Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sale of available-for-sale securities $ 97,555 $ 476,182 $ 97,555 $ 476,182
Gross gains 1,936 0 1,936 0
Gross losses (935) (18,659) (935) (18,659)
Net gains / (losses) $ 1,001 $ (18,659) $ 1,001 $ (18,659)