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Other Comprehensive Income Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Net unrealized gain on investment securities available-for-sale $ 78,424 $ 75,767 $ 71,843 $ 70,613 $ 68,736 $ 64,491
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Net unrealized gain on investment securities available-for-sale $ 2,593   $ 986