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Investments - Realized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Available For Sale Securities Gross Realized Gain Loss [Abstract]    
Proceeds from sales, calls and maturities of securities available for sale $ 16,648 $ 200
Gross gains on sales, calls and maturities of securities available for sale 94 0
Gross losses on sales, calls and maturities of securities available for sale (88) 0
Net gains on sale of securities available for sale [1] $ 6 $ 0
[1] Not within scope of ASC 606. Revenue streams are not related to contract with customers and are accounted for on an accrual basis under other provisions of GAAP.