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Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information About Recurring Level 3 Fair Value Measurement (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Investment securities available for sale, at fair value $ 363,601 $ 347,332
Recurring Securities Available for Sale    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Investment securities available for sale, at fair value 363,601 347,332
Level 3    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Investment securities available for sale, at fair value 2,002 2,022
Level 3 | Recurring Securities Available for Sale    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Investment securities available for sale, at fair value $ 2,002 $ 2,022