Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information About Recurring Level 3 Fair Value Measurement (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Investment securities available for sale, at fair value	$ 333,085	$ 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	333,085
Level 3
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Investment securities available for sale, at fair value	2,017	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	$ 2,017	$ 2,022