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Deposits - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deposits    
Deposit insurance per account owner $ 250,000  
Time deposits, each with a minimum denomination of $250,000 20,430,000 $ 18,032,000
Listing service deposits $ 8,506,000 $ 11,225,000