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Securities - Summary of Gross Proceeds and Gross Realized Gains and Losses from Sale of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]    
Gross proceeds $ 442,075 $ 363,346
Gross realized gains 1,877 $ 5,445
Gross realized losses $ 1,143