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Investment Securities - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) position | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Loss upon acquisition of interest-only GNMA securities | $ 7,500 | $ 7,476 | $ 0 | $ 0
Unrealized (gain) loss on investment securities |  | $ 1,299 | (1,634) | $ 0
Number of available for sale debt securities in an unrealized loss position (position) | position |  | 0 |  |
Pledged investment securities fair value |  | $ 20,400 | $ 23,000 |
Interest-only GNMA securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Loss upon acquisition of interest-only GNMA securities |  | 7,500 |  |
Interest-only GNMA securities |  | $ 16,272 |  |

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