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Supplemental Disclosure of Noncash Investing and Financing Activities Statement - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Supplemental Disclosure of Noncash Investing and Financing Activities [Abstract]    
Noncash or Part Noncash Acquisition, Investments Acquired $ 11,900,000 $ 2,500,000
Noncash or Part Noncash Acquisition, Net Unsettled Security Trades $ 5,000,000 $ 0