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Investment Securities - Schedule of Investment Securities Available for Sale and Aggregated by Investment Category and Length of Time Individual Securities in Continuous Unrealized Loss Position (Details)

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Investment Securities - Schedule of Investment Securities Available for Sale and Aggregated by Investment Category and Length of Time Individual Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months $ 83,754 $ 30,762
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 526 15
Investment Securities, Available for sale, Fair Value, 12 Months or More   481
Investment Securities, Available for sale, Unrealized Loss, 12 Months or More   1
Investment Securities, Available for sale, Fair Value 83,754 31,243
Investment Securities, Available for sale, Unrealized Loss 526 16
U.S. Treasury Securities    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months   30,762
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months   15
Investment Securities, Available for sale, Fair Value   30,762
Investment Securities, Available for sale, Unrealized Loss   15
Residential Mortgage-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months 72,806  
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 468  
Investment Securities, Available for sale, Fair Value, 12 Months or More   481
Investment Securities, Available for sale, Unrealized Loss, 12 Months or More   1
Investment Securities, Available for sale, Fair Value 72,806 481
Investment Securities, Available for sale, Unrealized Loss 468 $ 1
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months 10,948  
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 58  
Investment Securities, Available for sale, Fair Value 10,948  
Investment Securities, Available for sale, Unrealized Loss $ 58