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Transactions with Executive Officers, Directors, and Principal Shareholders - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Percentage of gross revenue 5.00%  
Percentage of aggregate amount of consolidated assets 5.00%  
Director    
Related Party Transaction [Line Items]    
Related party deposits $ 9.8 $ 15.3
Minimum    
Related Party Transaction [Line Items]    
Percentage of participation in equity 10.00%  
Letter of Credit | Affiliated Entity    
Related Party Transaction [Line Items]    
Outstanding commitment $ 0.5 $ 0.5