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Securities, Gains and (Losses) on Equity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Gains (losses) on equity securities [Abstract]          
Net gains and (losses) recognized on equity securities $ (114) $ 73 $ 539 $ (565)  
Less: Net gains and (losses) recognized on equity securities sold during the period 0 0 0 0  
Unrealized gains and (losses) recognized on equity securities still held (114) 73 539 (565)  
Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract]          
Carrying amount of equity securities without readily determinable fair values 1,000   1,000   $ 2,000
Impairment adjustments of equity securities without readily determinable fair values 0 0 0 0  
Downward adjustments of equity securities without readily determinable fair values 0 0 0 0  
Upward adjustments of equity securities without readily determinable fair values $ 0 $ 0 $ 0 $ 0