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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 | Mar. 31, 2020 | Dec. 31, 2019
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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

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